56999988 has 36 divisors (see below), whose sum is σ = 144344928. Its totient is φ = 18965520.

The previous prime is 56999947. The next prime is 56999989. The reversal of 56999988 is 88999965.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56999989) 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, 25683 + ... + 27813.

Almost surely, 2^56999988 is an apocalyptic number.

It is an amenable number.

56999988 is an abundant number, since it is smaller than the sum of its proper divisors (87344940).

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

56999988 is a wasteful number, since it uses less digits than its factorization.

56999988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884 (or 2879 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 63.

The square root of 56999988 is about 7549.8336405513. The cubic root of 56999988 is about 384.8500861207.

The spelling of 56999988 in words is "fifty-six million, nine hundred ninety-nine thousand, nine hundred eighty-eight".