256440402 has 24 divisors (see below), whose sum is σ = 559035984. Its totient is φ = 84954744.

The previous prime is 256440389. The next prime is 256440407. The reversal of 256440402 is 204044652.

256440402 is a `hidden beast` number, since 256 + 4 + 4 + 0 + 402 = 666.

256440402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (256440407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40768 + ... + 46635.

It is an arithmetic number, because the mean of its divisors is an integer number (23293166).

Almost surely, 2^256440402 is an apocalyptic number.

256440402 is an abundant number, since it is smaller than the sum of its proper divisors (302595582).

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

256440402 is a wasteful number, since it uses less digits than its factorization.

256440402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87574 (or 87571 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 256440402 is about 16013.7566485819. The cubic root of 256440402 is about 635.3243239602.

The spelling of 256440402 in words is "two hundred fifty-six million, four hundred forty thousand, four hundred two".