257693863 has 32 divisors (see below), whose sum is σ = 318689280. Its totient is φ = 203575680.

The previous prime is 257693833. The next prime is 257693879. The reversal of 257693863 is 368396752.

It is a happy number.

It is not a de Polignac number, because 257693863 - 2⁵ = 257693831 is a prime.

It is a super-2 number, since 2×257693863² = 132812254055725538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257693833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1078098 + ... + 1078336.

It is an arithmetic number, because the mean of its divisors is an integer number (9959040).

Almost surely, 2^257693863 is an apocalyptic number.

257693863 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

257693863 is a deficient number, since it is larger than the sum of its proper divisors (60995417).

257693863 is a wasteful number, since it uses less digits than its factorization.

257693863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487.

The product of its digits is 1632960, while the sum is 49.

The square root of 257693863 is about 16052.8459470587. The cubic root of 257693863 is about 636.3577808076.

The spelling of 257693863 in words is "two hundred fifty-seven million, six hundred ninety-three thousand, eight hundred sixty-three".