55597900 has 54 divisors (see below), whose sum is σ = 126241052. Its totient is φ = 21252000.

The previous prime is 55597891. The next prime is 55597907. The reversal of 55597900 is 979555.

It is a super-2 number, since 2×55597900² = 6182252968820000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55597907) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 52375 + ... + 53425.

Almost surely, 2^55597900 is an apocalyptic number.

55597900 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 55597900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63120526).

55597900 is an abundant number, since it is smaller than the sum of its proper divisors (70643152).

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

55597900 is a wasteful number, since it uses less digits than its factorization.

55597900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111 (or 1081 counting only the distinct ones).

The product of its (nonzero) digits is 70875, while the sum is 40.

The square root of 55597900 is about 7456.3999356258. The cubic root of 55597900 is about 381.6683341418.

The spelling of 55597900 in words is "fifty-five million, five hundred ninety-seven thousand, nine hundred".