56640015 has 12 divisors (see below), whose sum is σ = 98176104. Its totient is φ = 30207984.

The previous prime is 56640013. The next prime is 56640019. The reversal of 56640015 is 51004665.

It is a happy number.

56640015 is a `hidden beast` number, since 5 + 6 + 640 + 0 + 15 = 666.

It is not a de Polignac number, because 56640015 - 2¹ = 56640013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56640011) 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, 629289 + ... + 629378.

It is an arithmetic number, because the mean of its divisors is an integer number (8181342).

Almost surely, 2^56640015 is an apocalyptic number.

56640015 is a deficient number, since it is larger than the sum of its proper divisors (41536089).

56640015 is a wasteful number, since it uses less digits than its factorization.

56640015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258678 (or 1258675 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 56640015 is about 7525.9560854419. The cubic root of 56640015 is about 384.0382245477.

The spelling of 56640015 in words is "fifty-six million, six hundred forty thousand, fifteen".