56785281 has 16 divisors (see below), whose sum is σ = 91084800. Its totient is φ = 30740688.

The previous prime is 56785231. The next prime is 56785283. The reversal of 56785281 is 18258765.

It is not a de Polignac number, because 56785281 - 2⁷ = 56785153 is a prime.

It is a super-2 number, since 2×56785281² = 6449136276497922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56785283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70761 + ... + 71558.

It is an arithmetic number, because the mean of its divisors is an integer number (5692800).

Almost surely, 2^56785281 is an apocalyptic number.

It is an amenable number.

56785281 is a deficient number, since it is larger than the sum of its proper divisors (34299519).

56785281 is a wasteful number, since it uses less digits than its factorization.

56785281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142348.

The product of its digits is 134400, while the sum is 42.

The square root of 56785281 is about 7535.6009050374. The cubic root of 56785281 is about 384.3662616032.

The spelling of 56785281 in words is "fifty-six million, seven hundred eighty-five thousand, two hundred eighty-one".