56617840 has 20 divisors (see below), whose sum is σ = 131636664. Its totient is φ = 22647104.

The previous prime is 56617817. The next prime is 56617877. The reversal of 56617840 is 4871665.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 56617840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353782 + ... + 353941.

Almost surely, 2^56617840 is an apocalyptic number.

It is an amenable number.

56617840 is an abundant number, since it is smaller than the sum of its proper divisors (75018824).

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

56617840 is a wasteful number, since it uses less digits than its factorization.

56617840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707736 (or 707730 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 56617840 is about 7524.4827064723. The cubic root of 56617840 is about 383.9881000363.

The spelling of 56617840 in words is "fifty-six million, six hundred seventeen thousand, eight hundred forty".