257315564 has 24 divisors (see below), whose sum is σ = 491693328. Its totient is φ = 116853440.

The previous prime is 257315533. The next prime is 257315567. The reversal of 257315564 is 465513752.

It is a happy number.

It is a super-2 number, since 2×257315564² = 132422598953276192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257315567) 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, 63734 + ... + 67650.

It is an arithmetic number, because the mean of its divisors is an integer number (20487222).

Almost surely, 2^257315564 is an apocalyptic number.

It is an amenable number.

257315564 is a deficient number, since it is larger than the sum of its proper divisors (234377764).

257315564 is a wasteful number, since it uses less digits than its factorization.

257315564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5425 (or 5423 counting only the distinct ones).

The product of its digits is 126000, while the sum is 38.

The square root of 257315564 is about 16041.0586932409. The cubic root of 257315564 is about 636.0462336022.

The spelling of 257315564 in words is "two hundred fifty-seven million, three hundred fifteen thousand, five hundred sixty-four".