55915920 has 100 divisors (see below), whose sum is σ = 194226780. Its totient is φ = 14909184.

The previous prime is 55915913. The next prime is 55915933. The reversal of 55915920 is 2951955.

55915920 is a `hidden beast` number, since 559 + 15 + 92 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31945104 + 23970816 = 5652^2 + 4896^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2166 + ... + 10794.

Almost surely, 2^55915920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55915920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97113390).

55915920 is an abundant number, since it is smaller than the sum of its proper divisors (138310860).

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

55915920 is a wasteful number, since it uses less digits than its factorization.

55915920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8654 (or 8639 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The square root of 55915920 is about 7477.6948319653. The cubic root of 55915920 is about 382.3946653434.

It can be divided in two parts, 5591 and 5920, that added together give a palindrome (11511).

The spelling of 55915920 in words is "fifty-five million, nine hundred fifteen thousand, nine hundred twenty".