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55500000 = 2535637
BaseRepresentation
bin1101001110110…
…1110011100000
310212102200200120
43103231303200
5103202000000
65301320240
71242512403
oct323556340
9125380616
1055500000
1129367a76
1216706080
13b66294a
147529d3a
154d146a0
hex34edce0

55500000 has 168 divisors, whose sum is σ = 187028856. Its totient is φ = 14400000.

The previous prime is 55499993. The next prime is 55500031. The reversal of 55500000 is 555.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1499982 + ... + 1500018.

It is an arithmetic number, because the mean of its divisors is an integer number (1113267).

Almost surely, 255500000 is an apocalyptic number.

55500000 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 55500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93514428).

55500000 is an abundant number, since it is smaller than the sum of its proper divisors (131528856).

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

55500000 is an frugal number, since it uses more digits than its factorization.

55500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 15.

The square root of 55500000 is about 7449.8322128757. The cubic root of 55500000 is about 381.4441812927. Note that the first 3 decimals are identical.

Adding to 55500000 its reverse (555), we get a palindrome (55500555).

55500000 divided by its reverse (555) gives a 5-th power (100000 = 105).

The spelling of 55500000 in words is "fifty-five million, five hundred thousand".