256520402 has 8 divisors (see below), whose sum is σ = 386010876. Its totient is φ = 127850112.

The previous prime is 256520333. The next prime is 256520417. The reversal of 256520402 is 204025652.

It can be written as a sum of positive squares in 2 ways, for example, as 144985681 + 111534721 = 12041^2 + 10561^2 .

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

It is an unprimeable number.

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, 204263 + ... + 205514.

Almost surely, 2^256520402 is an apocalyptic number.

256520402 is a deficient number, since it is larger than the sum of its proper divisors (129490474).

256520402 is a wasteful number, since it uses less digits than its factorization.

256520402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410092.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 256520402 is about 16016.2543061728. The cubic root of 256520402 is about 635.3903830538.

The spelling of 256520402 in words is "two hundred fifty-six million, five hundred twenty thousand, four hundred two".