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55000000 = 265711
BaseRepresentation
bin1101000111001…
…1101111000000
310211111021211001
43101303233000
5103040000000
65242501344
71235330566
oct321635700
9124437731
1055000000
1129056350
1216504854
13b5191a3
147439a36
154c6646a
hex3473bc0

55000000 has 112 divisors (see below), whose sum is σ = 148827744. Its totient is φ = 20000000.

The previous prime is 54999943. The next prime is 55000013. The reversal of 55000000 is 55.

Adding to 55000000 its reverse (55), we get a palindrome (55000055).

Subtracting from 55000000 its reverse (55), we obtain a palindrome (54999945).

Multipling 55000000 by its reverse (55), we get a square (3025000000 = 550002).

55000000 divided by its reverse (55) gives a 6-th power (1000000 = 106).

It can be divided in two parts, 5 and 5000000, that multiplied together give a square (25000000 = 50002).

55000000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4999995 + ... + 5000005.

Almost surely, 255000000 is an apocalyptic number.

55000000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74413872).

55000000 is an abundant number, since it is smaller than the sum of its proper divisors (93827744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55000000 is an frugal number, since it uses more digits than its factorization.

55000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 10.

The square root of 55000000 is about 7416.1984870957. The cubic root of 55000000 is about 380.2952460761.

The spelling of 55000000 in words is "fifty-five million", and thus it is an aban number and an uban number.

Divisors: 1 2 4 5 8 10 11 16 20 22 25 32 40 44 50 55 64 80 88 100 110 125 160 176 200 220 250 275 320 352 400 440 500 550 625 704 800 880 1000 1100 1250 1375 1600 1760 2000 2200 2500 2750 3125 3520 4000 4400 5000 5500 6250 6875 8000 8800 10000 11000 12500 13750 15625 17600 20000 22000 25000 27500 31250 34375 40000 44000 50000 55000 62500 68750 78125 88000 100000 110000 125000 137500 156250 171875 200000 220000 250000 275000 312500 343750 440000 500000 550000 625000 687500 859375 1000000 1100000 1250000 1375000 1718750 2200000 2500000 2750000 3437500 5000000 5500000 6875000 11000000 13750000 27500000 55000000