256704407 has 4 divisors (see below), whose sum is σ = 256806000. Its totient is φ = 256602816.

The previous prime is 256704401. The next prime is 256704439. The reversal of 256704407 is 704407652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256704407 - 2¹⁴ = 256688023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256704401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46907 + ... + 52092.

It is an arithmetic number, because the mean of its divisors is an integer number (64201500).

Almost surely, 2^256704407 is an apocalyptic number.

256704407 is a deficient number, since it is larger than the sum of its proper divisors (101593).

256704407 is an equidigital number, since it uses as much as digits as its factorization.

256704407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101592.

The product of its (nonzero) digits is 47040, while the sum is 35.

The square root of 256704407 is about 16021.9975970539. The cubic root of 256704407 is about 635.5422709905.

The spelling of 256704407 in words is "two hundred fifty-six million, seven hundred four thousand, four hundred seven".