56428731 has 12 divisors (see below), whose sum is σ = 84527352. Its totient is φ = 37618992.

The previous prime is 56428709. The next prime is 56428733. The reversal of 56428731 is 13782465.

56428731 is a `hidden beast` number, since 5 + 642 + 8 + 7 + 3 + 1 = 666.

It is not a de Polignac number, because 56428731 - 2¹¹ = 56426683 is a prime.

It is a super-2 number, since 2×56428731² = 6368403364540722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56428733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115866 + ... + 116351.

It is an arithmetic number, because the mean of its divisors is an integer number (7043946).

Almost surely, 2^56428731 is an apocalyptic number.

56428731 is a deficient number, since it is larger than the sum of its proper divisors (28098621).

56428731 is an equidigital number, since it uses as much as digits as its factorization.

56428731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232232 (or 232220 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 56428731 is about 7511.9059498905. The cubic root of 56428731 is about 383.5601041746.

The spelling of 56428731 in words is "fifty-six million, four hundred twenty-eight thousand, seven hundred thirty-one".