55872720 has 80 divisors (see below), whose sum is σ = 192457920. Its totient is φ = 14898816.

The previous prime is 55872697. The next prime is 55872721. The reversal of 55872720 is 2727855.

55872720 is a `hidden beast` number, since 5 + 587 + 2 + 72 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55872721) 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 15 ways as a sum of consecutive naturals, for example, 10774 + ... + 15093.

It is an arithmetic number, because the mean of its divisors is an integer number (2405724).

Almost surely, 2^55872720 is an apocalyptic number.

It is an amenable number.

55872720 is an abundant number, since it is smaller than the sum of its proper divisors (136585200).

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

55872720 is a wasteful number, since it uses less digits than its factorization.

55872720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25889 (or 25877 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 55872720 is about 7474.8056830930. The cubic root of 55872720 is about 382.2961620572.

The spelling of 55872720 in words is "fifty-five million, eight hundred seventy-two thousand, seven hundred twenty".