56573987 has 2 divisors, whose sum is σ = 56573988. Its totient is φ = 56573986.

The previous prime is 56573981. The next prime is 56574047. The reversal of 56573987 is 78937565.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56573987 - 2⁴ = 56573971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56573981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28286993 + 28286994.

It is an arithmetic number, because the mean of its divisors is an integer number (28286994).

Almost surely, 2^56573987 is an apocalyptic number.

56573987 is a deficient number, since it is larger than the sum of its proper divisors (1).

56573987 is an equidigital number, since it uses as much as digits as its factorization.

56573987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1587600, while the sum is 50.

The square root of 56573987 is about 7521.5681210769. The cubic root of 56573987 is about 383.8889358886. Note that the first 3 decimals are identical.

The spelling of 56573987 in words is "fifty-six million, five hundred seventy-three thousand, nine hundred eighty-seven".