56639679 has 4 divisors (see below), whose sum is σ = 75519576. Its totient is φ = 37759784.

The previous prime is 56639663. The next prime is 56639707. The reversal of 56639679 is 97693665.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56639679 - 2⁴ = 56639663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56639629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9439944 + ... + 9439949.

It is an arithmetic number, because the mean of its divisors is an integer number (18879894).

Almost surely, 2^56639679 is an apocalyptic number.

56639679 is a deficient number, since it is larger than the sum of its proper divisors (18879897).

56639679 is a wasteful number, since it uses less digits than its factorization.

56639679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18879896.

The product of its digits is 1837080, while the sum is 51.

The square root of 56639679 is about 7525.9337626636. The cubic root of 56639679 is about 384.0374651488.

The spelling of 56639679 in words is "fifty-six million, six hundred thirty-nine thousand, six hundred seventy-nine".