256928730 has 16 divisors (see below), whose sum is σ = 616629024. Its totient is φ = 68514320.

The previous prime is 256928681. The next prime is 256928731. The reversal of 256928730 is 37829652.

It is not an unprimeable number, because it can be changed into a prime (256928731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4282116 + ... + 4282175.

It is an arithmetic number, because the mean of its divisors is an integer number (38539314).

Almost surely, 2^256928730 is an apocalyptic number.

256928730 is an abundant number, since it is smaller than the sum of its proper divisors (359700294).

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

256928730 is a wasteful number, since it uses less digits than its factorization.

256928730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8564301.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 256928730 is about 16028.9965375254. The cubic root of 256928730 is about 635.7273414937.

The spelling of 256928730 in words is "two hundred fifty-six million, nine hundred twenty-eight thousand, seven hundred thirty".