257215675 has 12 divisors (see below), whose sum is σ = 327568816. Its totient is φ = 200210400.

The previous prime is 257215669. The next prime is 257215681. The reversal of 257215675 is 576512752.

It is an interprime number because it is at equal distance from previous prime (257215669) and next prime (257215681).

It is not a de Polignac number, because 257215675 - 2³ = 257215667 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138111 + ... + 139960.

Almost surely, 2^257215675 is an apocalyptic number.

257215675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

257215675 is a deficient number, since it is larger than the sum of its proper divisors (70353141).

257215675 is a wasteful number, since it uses less digits than its factorization.

257215675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278118 (or 278113 counting only the distinct ones).

The product of its digits is 147000, while the sum is 40.

The square root of 257215675 is about 16037.9448496371. The cubic root of 257215675 is about 635.9639193104.

The spelling of 257215675 in words is "two hundred fifty-seven million, two hundred fifteen thousand, six hundred seventy-five".