56285991 has 24 divisors (see below), whose sum is σ = 87141600. Its totient is φ = 34917696.

The previous prime is 56285969. The next prime is 56286007. The reversal of 56285991 is 19958265.

56285991 is a `hidden beast` number, since 56 + 2 + 8 + 599 + 1 = 666.

It is not a de Polignac number, because 56285991 - 2⁶ = 56285927 is a prime.

It is a super-2 number, since 2×56285991² = 6336225565704162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56285921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3985 + ... + 11333.

It is an arithmetic number, because the mean of its divisors is an integer number (3630900).

Almost surely, 2^56285991 is an apocalyptic number.

56285991 is a deficient number, since it is larger than the sum of its proper divisors (30855609).

56285991 is a wasteful number, since it uses less digits than its factorization.

56285991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7415 (or 7412 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 56285991 is about 7502.3990163147. The cubic root of 56285991 is about 383.2364180118.

The spelling of 56285991 in words is "fifty-six million, two hundred eighty-five thousand, nine hundred ninety-one".