257907628 has 18 divisors (see below), whose sum is σ = 496100108. Its totient is φ = 117230520.

The previous prime is 257907583. The next prime is 257907647. The reversal of 257907628 is 826709752.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 265950 + ... + 266917.

Almost surely, 2^257907628 is an apocalyptic number.

It is an amenable number.

257907628 is a deficient number, since it is larger than the sum of its proper divisors (238192480).

257907628 is a wasteful number, since it uses less digits than its factorization.

257907628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532893 (or 532880 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 257907628 is about 16059.5027320275. The cubic root of 257907628 is about 636.5336916381.

The spelling of 257907628 in words is "two hundred fifty-seven million, nine hundred seven thousand, six hundred twenty-eight".