55550000 has 120 divisors (see below), whose sum is σ = 148209264. Its totient is φ = 20000000.

The previous prime is 55549979. The next prime is 55550017. The reversal of 55550000 is 5555.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 549950 + ... + 550050.

Almost surely, 2^55550000 is an apocalyptic number.

55550000 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 55550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74104632).

55550000 is an abundant number, since it is smaller than the sum of its proper divisors (92659264).

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

55550000 is a wasteful number, since it uses less digits than its factorization.

55550000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 20.

The square root of 55550000 is about 7453.1872376856. The cubic root of 55550000 is about 381.5586947133.

Adding to 55550000 its reverse (5555), we get a palindrome (55555555).

Multiplying 55550000 by its reverse (5555), we get a square (308580250000 = 555500²).

55550000 divided by its reverse (5555) gives a 4-th power (10000 = 10⁴).

It can be divided in two parts, 55 and 550000, that multiplied together give a square (30250000 = 5500²).

The spelling of 55550000 in words is "fifty-five million, five hundred fifty thousand".