56798991 has 24 divisors (see below), whose sum is σ = 83907824. Its totient is φ = 37013760.

The previous prime is 56798971. The next prime is 56798993. The reversal of 56798991 is 19989765.

It is not a de Polignac number, because 56798991 - 2⁶ = 56798927 is a prime.

It is a super-2 number, since 2×56798991² = 6452250757236162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56798993) 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, 168375 + ... + 168711.

Almost surely, 2^56798991 is an apocalyptic number.

56798991 is a deficient number, since it is larger than the sum of its proper divisors (27108833).

56798991 is a wasteful number, since it uses less digits than its factorization.

56798991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711 (or 708 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 56798991 is about 7536.5105320699. The cubic root of 56798991 is about 384.3971923732.

The spelling of 56798991 in words is "fifty-six million, seven hundred ninety-eight thousand, nine hundred ninety-one".