55969920 has 256 divisors, whose sum is σ = 205632000. Its totient is φ = 14376960.

The previous prime is 55969909. The next prime is 55969951. The reversal of 55969920 is 2996955.

55969920 is a `hidden beast` number, since 559 + 6 + 9 + 92 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 708441 + ... + 708519.

It is an arithmetic number, because the mean of its divisors is an integer number (803250).

Almost surely, 2^55969920 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 55969920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102816000).

55969920 is an abundant number, since it is smaller than the sum of its proper divisors (149662080).

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

55969920 is a wasteful number, since it uses less digits than its factorization.

55969920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 45.

The square root of 55969920 is about 7481.3046990482. The cubic root of 55969920 is about 382.5177231311.

The spelling of 55969920 in words is "fifty-five million, nine hundred sixty-nine thousand, nine hundred twenty".