256512708 has 18 divisors (see below), whose sum is σ = 648407214. Its totient is φ = 85504224.

The previous prime is 256512701. The next prime is 256512709. The reversal of 256512708 is 807215652.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 128867904 + 127644804 = 11352^2 + 11298^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 7125353 = 256512708 / (2 + 5 + 6 + 5 + 1 + 2 + 7 + 0 + 8).

It is not an unprimeable number, because it can be changed into a prime (256512701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3562641 + ... + 3562712.

It is an arithmetic number, because the mean of its divisors is an integer number (36022623).

Almost surely, 2^256512708 is an apocalyptic number.

It is an amenable number.

256512708 is an abundant number, since it is smaller than the sum of its proper divisors (391894506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256512708 is a wasteful number, since it uses less digits than its factorization.

256512708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7125363 (or 7125358 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 256512708 is about 16016.0141108829. The cubic root of 256512708 is about 635.3840304174.

The spelling of 256512708 in words is "two hundred fifty-six million, five hundred twelve thousand, seven hundred eight".