55951920 has 60 divisors (see below), whose sum is σ = 187907616. Its totient is φ = 14920320.

The previous prime is 55951891. The next prime is 55951927. The reversal of 55951920 is 2915955.

It is a tau number, because it is divible by the number of its divisors (60).

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

It is not an unprimeable number, because it can be changed into a prime (55951927) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 38136 + ... + 39575.

Almost surely, 2^55951920 is an apocalyptic number.

It is an amenable number.

55951920 is an abundant number, since it is smaller than the sum of its proper divisors (131955696).

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

55951920 is a wasteful number, since it uses less digits than its factorization.

55951920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77730 (or 77721 counting only the distinct ones).

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

The square root of 55951920 is about 7480.1016035880. The cubic root of 55951920 is about 382.4767126666.

The spelling of 55951920 in words is "fifty-five million, nine hundred fifty-one thousand, nine hundred twenty".