256430636 has 96 divisors (see below), whose sum is σ = 585252864. Its totient is φ = 95400000.

The previous prime is 256430563. The next prime is 256430663. The reversal of 256430636 is 636034652.

It is a junction number, because it is equal to n+sod(n) for n = 256430596 and 256430605.

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 31 ways as a sum of consecutive naturals, for example, 1021511 + ... + 1021761.

It is an arithmetic number, because the mean of its divisors is an integer number (6096384).

Almost surely, 2^256430636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256430636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292626432).

256430636 is an abundant number, since it is smaller than the sum of its proper divisors (328822228).

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

256430636 is a wasteful number, since it uses less digits than its factorization.

256430636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 35.

The square root of 256430636 is about 16013.4517203506. The cubic root of 256430636 is about 635.3162588554.

The spelling of 256430636 in words is "two hundred fifty-six million, four hundred thirty thousand, six hundred thirty-six".