257643964 has 24 divisors (see below), whose sum is σ = 461764800. Its totient is φ = 125748480.

The previous prime is 257643949. The next prime is 257643977. The reversal of 257643964 is 469346752.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23544 + ... + 32704.

It is an arithmetic number, because the mean of its divisors is an integer number (19240200).

Almost surely, 2^257643964 is an apocalyptic number.

It is an amenable number.

257643964 is a deficient number, since it is larger than the sum of its proper divisors (204120836).

257643964 is a wasteful number, since it uses less digits than its factorization.

257643964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9333 (or 9331 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 46.

The square root of 257643964 is about 16051.2916614209. The cubic root of 257643964 is about 636.3167040737.

The spelling of 257643964 in words is "two hundred fifty-seven million, six hundred forty-three thousand, nine hundred sixty-four".