256401718 has 8 divisors (see below), whose sum is σ = 407226312. Its totient is φ = 120659616.

The previous prime is 256401707. The next prime is 256401737. The reversal of 256401718 is 817104652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 7541227 = 256401718 / (2 + 5 + 6 + 4 + 0 + 1 + 7 + 1 + 8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3770580 + ... + 3770647.

It is an arithmetic number, because the mean of its divisors is an integer number (50903289).

Almost surely, 2^256401718 is an apocalyptic number.

256401718 is a deficient number, since it is larger than the sum of its proper divisors (150824594).

256401718 is a wasteful number, since it uses less digits than its factorization.

256401718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7541246.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 256401718 is about 16012.5487665143. The cubic root of 256401718 is about 635.2923761575.

The spelling of 256401718 in words is "two hundred fifty-six million, four hundred one thousand, seven hundred eighteen".