256634020 has 12 divisors (see below), whose sum is σ = 538931484. Its totient is φ = 102653600.

The previous prime is 256633999. The next prime is 256634033. The reversal of 256634020 is 20436652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 191767104 + 64866916 = 13848^2 + 8054^2 .

It is a super-2 number, since 2×256634020² = 131722040442720800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256634020.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6415831 + ... + 6415870.

It is an arithmetic number, because the mean of its divisors is an integer number (44910957).

Almost surely, 2^256634020 is an apocalyptic number.

256634020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256634020 is an abundant number, since it is smaller than the sum of its proper divisors (282297464).

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

256634020 is a wasteful number, since it uses less digits than its factorization.

256634020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12831710 (or 12831708 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 256634020 is about 16019.8008726700. The cubic root of 256634020 is about 635.4841782298.

The spelling of 256634020 in words is "two hundred fifty-six million, six hundred thirty-four thousand, twenty".