56981568 has 56 divisors (see below), whose sum is σ = 172305472. Its totient is φ = 16280064.

The previous prime is 56981567. The next prime is 56981581. The reversal of 56981568 is 86518965.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (56981563) 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 7 ways as a sum of consecutive naturals, for example, 19855 + ... + 22542.

Almost surely, 2^56981568 is an apocalyptic number.

It is an amenable number.

56981568 is an abundant number, since it is smaller than the sum of its proper divisors (115323904).

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

56981568 is a wasteful number, since it uses less digits than its factorization.

56981568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42419 (or 42409 counting only the distinct ones).

The product of its digits is 518400, while the sum is 48.

The square root of 56981568 is about 7548.6136475514. The cubic root of 56981568 is about 384.8086258643.

The spelling of 56981568 in words is "fifty-six million, nine hundred eighty-one thousand, five hundred sixty-eight".