257243564 has 6 divisors (see below), whose sum is σ = 450176244. Its totient is φ = 128621780.

The previous prime is 257243563. The next prime is 257243593. The reversal of 257243564 is 465342752.

It is not an unprimeable number, because it can be changed into a prime (257243563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32155442 + ... + 32155449.

It is an arithmetic number, because the mean of its divisors is an integer number (75029374).

Almost surely, 2^257243564 is an apocalyptic number.

It is an amenable number.

257243564 is a deficient number, since it is larger than the sum of its proper divisors (192932680).

257243564 is a wasteful number, since it uses less digits than its factorization.

257243564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64310895 (or 64310893 counting only the distinct ones).

The product of its digits is 201600, while the sum is 38.

The square root of 257243564 is about 16038.8142953274. The cubic root of 257243564 is about 635.9869035975.

The spelling of 257243564 in words is "two hundred fifty-seven million, two hundred forty-three thousand, five hundred sixty-four".