257645375 has 16 divisors (see below), whose sum is σ = 346277568. Its totient is φ = 190260000.

The previous prime is 257645369. The next prime is 257645383. The reversal of 257645375 is 573546752.

It is not a de Polignac number, because 257645375 - 2⁸ = 257645119 is a prime.

It is a super-2 number, since 2×257645375² = 132762278517781250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77651 + ... + 80900.

It is an arithmetic number, because the mean of its divisors is an integer number (21642348).

Almost surely, 2^257645375 is an apocalyptic number.

257645375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

257645375 is a deficient number, since it is larger than the sum of its proper divisors (88632193).

257645375 is a wasteful number, since it uses less digits than its factorization.

257645375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158579 (or 158569 counting only the distinct ones).

The product of its digits is 882000, while the sum is 44.

The square root of 257645375 is about 16051.3356142098. The cubic root of 257645375 is about 636.3178656783.

The spelling of 257645375 in words is "two hundred fifty-seven million, six hundred forty-five thousand, three hundred seventy-five".