56661984 has 48 divisors (see below), whose sum is σ = 165266640. Its totient is φ = 18887040.

The previous prime is 56661973. The next prime is 56662013. The reversal of 56661984 is 48916665.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31927 + ... + 33654.

It is an arithmetic number, because the mean of its divisors is an integer number (3443055).

Almost surely, 2^56661984 is an apocalyptic number.

56661984 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

56661984 is an abundant number, since it is smaller than the sum of its proper divisors (108604656).

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

56661984 is a wasteful number, since it uses less digits than its factorization.

56661984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65600 (or 65586 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 56661984 is about 7527.4154927173. The cubic root of 56661984 is about 384.0878705161.

The spelling of 56661984 in words is "fifty-six million, six hundred sixty-one thousand, nine hundred eighty-four".