257633457 has 8 divisors (see below), whose sum is σ = 347859840. Its totient is φ = 169581360.

The previous prime is 257633437. The next prime is 257633489. The reversal of 257633457 is 754336752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257633457 - 2⁶ = 257633393 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (257633437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 543294 + ... + 543767.

It is an arithmetic number, because the mean of its divisors is an integer number (43482480).

Almost surely, 2^257633457 is an apocalyptic number.

It is an amenable number.

257633457 is a deficient number, since it is larger than the sum of its proper divisors (90226383).

257633457 is a wasteful number, since it uses less digits than its factorization.

257633457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087143.

The product of its digits is 529200, while the sum is 42.

The square root of 257633457 is about 16050.9643635515. The cubic root of 257633457 is about 636.3080540613.

The spelling of 257633457 in words is "two hundred fifty-seven million, six hundred thirty-three thousand, four hundred fifty-seven".