256764320 has 48 divisors (see below), whose sum is σ = 626185728. Its totient is φ = 99390720.

The previous prime is 256764317. The next prime is 256764353. The reversal of 256764320 is 23467652.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20924 + ... + 30843.

It is an arithmetic number, because the mean of its divisors is an integer number (13045536).

Almost surely, 2^256764320 is an apocalyptic number.

256764320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256764320 is an abundant number, since it is smaller than the sum of its proper divisors (369421408).

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

256764320 is a wasteful number, since it uses less digits than its factorization.

256764320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51813 (or 51805 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 256764320 is about 16023.8671986509. The cubic root of 256764320 is about 635.5917108405.

The spelling of 256764320 in words is "two hundred fifty-six million, seven hundred sixty-four thousand, three hundred twenty".