256958564 has 6 divisors (see below), whose sum is σ = 449677494. Its totient is φ = 128479280.

The previous prime is 256958561. The next prime is 256958567. The reversal of 256958564 is 465859652.

It is an interprime number because it is at equal distance from previous prime (256958561) and next prime (256958567).

It can be written as a sum of positive squares in only one way, i.e., 205692964 + 51265600 = 14342^2 + 7160^2 .

It is a super-2 number, since 2×256958564² = 132055407225884192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256958561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32119817 + ... + 32119824.

It is an arithmetic number, because the mean of its divisors is an integer number (74946249).

Almost surely, 2^256958564 is an apocalyptic number.

It is an amenable number.

256958564 is a deficient number, since it is larger than the sum of its proper divisors (192718930).

256958564 is a wasteful number, since it uses less digits than its factorization.

256958564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64239645 (or 64239643 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 50.

The square root of 256958564 is about 16029.9271364532. The cubic root of 256958564 is about 635.7519469623.

The spelling of 256958564 in words is "two hundred fifty-six million, nine hundred fifty-eight thousand, five hundred sixty-four".