256221696 has 80 divisors (see below), whose sum is σ = 704740608. Its totient is φ = 82636800.

The previous prime is 256221673. The next prime is 256221697. The reversal of 256221696 is 696122652.

256221696 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×256221696² = 131299115002232832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256221697) 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, 44926 + ... + 50306.

Almost surely, 2^256221696 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 256221696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352370304).

256221696 is an abundant number, since it is smaller than the sum of its proper divisors (448518912).

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

256221696 is an equidigital number, since it uses as much as digits as its factorization.

256221696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5433 (or 5417 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 256221696 is about 16006.9265007371. The cubic root of 256221696 is about 635.1436598106.

The spelling of 256221696 in words is "two hundred fifty-six million, two hundred twenty-one thousand, six hundred ninety-six".