55505100 has 72 divisors (see below), whose sum is σ = 183543808. Its totient is φ = 12686400.

The previous prime is 55505081. The next prime is 55505123. The reversal of 55505100 is 150555.

It is a super-2 number, since 2×55505100² = 6161632252020000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11116 + ... + 15315.

Almost surely, 2^55505100 is an apocalyptic number.

55505100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55505100 is an abundant number, since it is smaller than the sum of its proper divisors (128038708).

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

55505100 is a wasteful number, since it uses less digits than its factorization.

55505100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26455 (or 26448 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 21.

The square root of 55505100 is about 7450.1744946008. The cubic root of 55505100 is about 381.4558648106.

Adding to 55505100 its reverse (150555), we get a palindrome (55655655).

The spelling of 55505100 in words is "fifty-five million, five hundred five thousand, one hundred".