56401515 has 48 divisors (see below), whose sum is σ = 103180896. Its totient is φ = 29548800.

The previous prime is 56401511. The next prime is 56401537. The reversal of 56401515 is 51510465.

It is a happy number.

56401515 is a `hidden beast` number, since 5 + 640 + 1 + 5 + 15 = 666.

It is not a de Polignac number, because 56401515 - 2² = 56401511 is a prime.

It is a super-2 number, since 2×56401515² = 6362261788590450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (56401511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 73735 + ... + 74495.

It is an arithmetic number, because the mean of its divisors is an integer number (2149602).

Almost surely, 2^56401515 is an apocalyptic number.

56401515 is a deficient number, since it is larger than the sum of its proper divisors (46779381).

56401515 is an equidigital number, since it uses as much as digits as its factorization.

56401515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842 (or 830 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 56401515 is about 7510.0942071322. The cubic root of 56401515 is about 383.4984296203.

The spelling of 56401515 in words is "fifty-six million, four hundred one thousand, five hundred fifteen".