56659840 has 64 divisors (see below), whose sum is σ = 136402560. Its totient is φ = 22505472.

The previous prime is 56659831. The next prime is 56659873. The reversal of 56659840 is 4895665.

It is a tau number, because it is divible by the number of its divisors (64).

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, 142522 + ... + 142918.

It is an arithmetic number, because the mean of its divisors is an integer number (2131290).

Almost surely, 2^56659840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56659840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68201280).

56659840 is an abundant number, since it is smaller than the sum of its proper divisors (79742720).

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

56659840 is a wasteful number, since it uses less digits than its factorization.

56659840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 56659840 is about 7527.2730786122. The cubic root of 56659840 is about 384.0830260288.

It can be divided in two parts, 566 and 59840, that added together give a palindrome (60406).

The spelling of 56659840 in words is "fifty-six million, six hundred fifty-nine thousand, eight hundred forty".