56720988 has 18 divisors (see below), whose sum is σ = 143378144. Its totient is φ = 18906984.

The previous prime is 56720987. The next prime is 56721001. The reversal of 56720988 is 88902765.

56720988 is a `hidden beast` number, since 567 + 2 + 0 + 9 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×56720988² = 6434540959392288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56720987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 787756 + ... + 787827.

Almost surely, 2^56720988 is an apocalyptic number.

It is an amenable number.

56720988 is an abundant number, since it is smaller than the sum of its proper divisors (86657156).

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

56720988 is a wasteful number, since it uses less digits than its factorization.

56720988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575593 (or 1575588 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 56720988 is about 7531.3337464223. Note that the first 3 decimals coincide. The cubic root of 56720988 is about 384.2211454045.

The spelling of 56720988 in words is "fifty-six million, seven hundred twenty thousand, nine hundred eighty-eight".