257845864 has 8 divisors (see below), whose sum is σ = 483461010. Its totient is φ = 128922928.

The previous prime is 257845831. The next prime is 257845897. The reversal of 257845864 is 468548752.

It is an interprime number because it is at equal distance from previous prime (257845831) and next prime (257845897).

It can be written as a sum of positive squares in only one way, i.e., 211469764 + 46376100 = 14542^2 + 6810^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16115359 + ... + 16115374.

Almost surely, 2^257845864 is an apocalyptic number.

It is an amenable number.

257845864 is a deficient number, since it is larger than the sum of its proper divisors (225615146).

257845864 is a wasteful number, since it uses less digits than its factorization.

257845864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32230739 (or 32230735 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 49.

The square root of 257845864 is about 16057.5796432713. The cubic root of 257845864 is about 636.4828749871.

The spelling of 257845864 in words is "two hundred fifty-seven million, eight hundred forty-five thousand, eight hundred sixty-four".