257127664 has 20 divisors (see below), whose sum is σ = 506630520. Its totient is φ = 126384320.

The previous prime is 257127653. The next prime is 257127713. The reversal of 257127664 is 466721752.

It is a super-2 number, since 2×257127664² = 132229271188193792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135247 + ... + 137134.

It is an arithmetic number, because the mean of its divisors is an integer number (25331526).

Almost surely, 2^257127664 is an apocalyptic number.

It is an amenable number.

257127664 is a deficient number, since it is larger than the sum of its proper divisors (249502856).

257127664 is a wasteful number, since it uses less digits than its factorization.

257127664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272448 (or 272442 counting only the distinct ones).

The product of its digits is 141120, while the sum is 40.

The square root of 257127664 is about 16035.2007782877. The cubic root of 257127664 is about 635.8913755128.

The spelling of 257127664 in words is "two hundred fifty-seven million, one hundred twenty-seven thousand, six hundred sixty-four".