256904506 has 8 divisors (see below), whose sum is σ = 385513920. Its totient is φ = 128399868.

The previous prime is 256904497. The next prime is 256904507. The reversal of 256904506 is 605409652.

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

It is not an unprimeable number, because it can be changed into a prime (256904507) by changing a digit.

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, 19746 + ... + 30061.

It is an arithmetic number, because the mean of its divisors is an integer number (48189240).

Almost surely, 2^256904506 is an apocalyptic number.

256904506 is a deficient number, since it is larger than the sum of its proper divisors (128609414).

256904506 is a wasteful number, since it uses less digits than its factorization.

256904506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52388.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 256904506 is about 16028.2408891307. The cubic root of 256904506 is about 635.7073614482.

The spelling of 256904506 in words is "two hundred fifty-six million, nine hundred four thousand, five hundred six".