56687879 has 2 divisors, whose sum is σ = 56687880. Its totient is φ = 56687878.

The previous prime is 56687863. The next prime is 56687903. The reversal of 56687879 is 97878665.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56687879 - 2⁴ = 56687863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56687179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28343939 + 28343940.

It is an arithmetic number, because the mean of its divisors is an integer number (28343940).

Almost surely, 2^56687879 is an apocalyptic number.

56687879 is a deficient number, since it is larger than the sum of its proper divisors (1).

56687879 is an equidigital number, since it uses as much as digits as its factorization.

56687879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 56.

The square root of 56687879 is about 7529.1353421226. The cubic root of 56687879 is about 384.1463720602.

The spelling of 56687879 in words is "fifty-six million, six hundred eighty-seven thousand, eight hundred seventy-nine".