256623536 has 40 divisors (see below), whose sum is σ = 543027744. Its totient is φ = 116766720.

The previous prime is 256623533. The next prime is 256623547. The reversal of 256623536 is 635326652.

It is a self number, because there is not a number n which added to its sum of digits gives 256623536.

It is not an unprimeable number, because it can be changed into a prime (256623533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6080 + ... + 23456.

Almost surely, 2^256623536 is an apocalyptic number.

256623536 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256623536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271513872).

256623536 is an abundant number, since it is smaller than the sum of its proper divisors (286404208).

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

256623536 is a wasteful number, since it uses less digits than its factorization.

256623536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17469 (or 17463 counting only the distinct ones).

The product of its digits is 194400, while the sum is 38.

The square root of 256623536 is about 16019.4736492807. The cubic root of 256623536 is about 635.4755245228.

The spelling of 256623536 in words is "two hundred fifty-six million, six hundred twenty-three thousand, five hundred thirty-six".