256181264 has 10 divisors (see below), whose sum is σ = 496351230. Its totient is φ = 128090624.

The previous prime is 256181251. The next prime is 256181269. The reversal of 256181264 is 462181652.

It can be written as a sum of positive squares in only one way, i.e., 158961664 + 97219600 = 12608^2 + 9860^2 .

It is not an unprimeable number, because it can be changed into a prime (256181269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8005649 + ... + 8005680.

It is an arithmetic number, because the mean of its divisors is an integer number (49635123).

Almost surely, 2^256181264 is an apocalyptic number.

It is an amenable number.

256181264 is a deficient number, since it is larger than the sum of its proper divisors (240169966).

256181264 is a wasteful number, since it uses less digits than its factorization.

256181264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16011337 (or 16011331 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 256181264 is about 16005.6634976498. The cubic root of 256181264 is about 635.1102493178.

The spelling of 256181264 in words is "two hundred fifty-six million, one hundred eighty-one thousand, two hundred sixty-four".