56709840 has 80 divisors (see below), whose sum is σ = 191791296. Its totient is φ = 13747200.

The previous prime is 56709827. The next prime is 56709907. The reversal of 56709840 is 4890765.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8101 + ... + 13380.

Almost surely, 2^56709840 is an apocalyptic number.

It is an amenable number.

56709840 is an abundant number, since it is smaller than the sum of its proper divisors (135081456).

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

56709840 is a wasteful number, since it uses less digits than its factorization.

56709840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21508 (or 21502 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 56709840 is about 7530.5936021007. The cubic root of 56709840 is about 384.1959720185.

The spelling of 56709840 in words is "fifty-six million, seven hundred nine thousand, eight hundred forty".