256825064 has 8 divisors (see below), whose sum is σ = 481547010. Its totient is φ = 128412528.

The previous prime is 256825043. The next prime is 256825081. The reversal of 256825064 is 460528652.

It can be written as a sum of positive squares in only one way, i.e., 245548900 + 11276164 = 15670^2 + 3358^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×256825064² = 131918226997208192, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 16051559 + ... + 16051574.

Almost surely, 2^256825064 is an apocalyptic number.

It is an amenable number.

256825064 is a deficient number, since it is larger than the sum of its proper divisors (224721946).

256825064 is a wasteful number, since it uses less digits than its factorization.

256825064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32103139 (or 32103135 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 256825064 is about 16025.7625091601. The cubic root of 256825064 is about 635.6418285758.

The spelling of 256825064 in words is "two hundred fifty-six million, eight hundred twenty-five thousand, sixty-four".