55931920 has 40 divisors (see below), whose sum is σ = 141865920. Its totient is φ = 20338560.

The previous prime is 55931899. The next prime is 55931963. The reversal of 55931920 is 2913955.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 30900 + ... + 32659.

It is an arithmetic number, because the mean of its divisors is an integer number (3546648).

Almost surely, 2^55931920 is an apocalyptic number.

It is an amenable number.

55931920 is an abundant number, since it is smaller than the sum of its proper divisors (85934000).

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

55931920 is a wasteful number, since it uses less digits than its factorization.

55931920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63583 (or 63577 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 55931920 is about 7478.7646038634. The cubic root of 55931920 is about 382.4311351667.

The spelling of 55931920 in words is "fifty-five million, nine hundred thirty-one thousand, nine hundred twenty".