256723450 has 24 divisors (see below), whose sum is σ = 479219328. Its totient is φ = 102320880.

The previous prime is 256723429. The next prime is 256723463. The reversal of 256723450 is 54327652.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5079 + ... + 23221.

It is an arithmetic number, because the mean of its divisors is an integer number (19967472).

Almost surely, 2^256723450 is an apocalyptic number.

256723450 is a deficient number, since it is larger than the sum of its proper divisors (222495878).

256723450 is a wasteful number, since it uses less digits than its factorization.

256723450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18438 (or 18433 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 34.

The square root of 256723450 is about 16022.5918627418. The cubic root of 256723450 is about 635.5579859943.

The spelling of 256723450 in words is "two hundred fifty-six million, seven hundred twenty-three thousand, four hundred fifty".