57664987 has 2 divisors, whose sum is σ = 57664988. Its totient is φ = 57664986.

The previous prime is 57664967. The next prime is 57665009. The reversal of 57664987 is 78946675.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57664987 is a prime.

It is not a weakly prime, because it can be changed into another prime (57664967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28832493 + 28832494.

It is an arithmetic number, because the mean of its divisors is an integer number (28832494).

Almost surely, 2^57664987 is an apocalyptic number.

57664987 is a deficient number, since it is larger than the sum of its proper divisors (1).

57664987 is an equidigital number, since it uses as much as digits as its factorization.

57664987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 52.

The square root of 57664987 is about 7593.7465720157. The cubic root of 57664987 is about 386.3409405932.

The spelling of 57664987 in words is "fifty-seven million, six hundred sixty-four thousand, nine hundred eighty-seven".