56531787 has 16 divisors (see below), whose sum is σ = 81312000. Its totient is φ = 34729632.

The previous prime is 56531779. The next prime is 56531801. The reversal of 56531787 is 78713565.

It is not a de Polignac number, because 56531787 - 2³ = 56531779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56531737) 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, 36964 + ... + 38462.

It is an arithmetic number, because the mean of its divisors is an integer number (5082000).

Almost surely, 2^56531787 is an apocalyptic number.

56531787 is a deficient number, since it is larger than the sum of its proper divisors (24780213).

56531787 is a wasteful number, since it uses less digits than its factorization.

56531787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482.

The product of its digits is 176400, while the sum is 42.

The square root of 56531787 is about 7518.7623316607. The cubic root of 56531787 is about 383.7934612506.

The spelling of 56531787 in words is "fifty-six million, five hundred thirty-one thousand, seven hundred eighty-seven".