256531696 has 80 divisors (see below), whose sum is σ = 542822400. Its totient is φ = 117089280.

The previous prime is 256531663. The next prime is 256531721. The reversal of 256531696 is 696135652.

It is a super-2 number, since 2×256531696² = 131617022105272832, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1289005 + ... + 1289203.

It is an arithmetic number, because the mean of its divisors is an integer number (6785280).

Almost surely, 2^256531696 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 256531696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271411200).

256531696 is an abundant number, since it is smaller than the sum of its proper divisors (286290704).

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

256531696 is a wasteful number, since it uses less digits than its factorization.

256531696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 368 counting only the distinct ones).

The product of its digits is 291600, while the sum is 43.

The square root of 256531696 is about 16016.6068816089. The cubic root of 256531696 is about 635.3997078399.

The spelling of 256531696 in words is "two hundred fifty-six million, five hundred thirty-one thousand, six hundred ninety-six".