256709056 has 28 divisors (see below), whose sum is σ = 509960880. Its totient is φ = 128215040.

The previous prime is 256709029. The next prime is 256709069. The reversal of 256709056 is 650907652.

It is a super-2 number, since 2×256709056² = 131799078864822272, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

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, 82896 + ... + 85936.

Almost surely, 2^256709056 is an apocalyptic number.

It is an amenable number.

256709056 is a deficient number, since it is larger than the sum of its proper divisors (253251824).

256709056 is a wasteful number, since it uses less digits than its factorization.

256709056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4372 (or 4362 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 256709056 is about 16022.1426781813. The cubic root of 256709056 is about 635.5461075928.

The spelling of 256709056 in words is "two hundred fifty-six million, seven hundred nine thousand, fifty-six".