256396224 has 84 divisors (see below), whose sum is σ = 789166824. Its totient is φ = 73253376.

The previous prime is 256396211. The next prime is 256396253. The reversal of 256396224 is 422693652.

It is a tau number, because it is divible by the number of its divisors (84).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4219 + ... + 23034.

Almost surely, 2^256396224 is an apocalyptic number.

256396224 is a gapful number since it is divisible by the number (24) 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 256396224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394583412).

256396224 is an abundant number, since it is smaller than the sum of its proper divisors (532770600).

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

256396224 is a wasteful number, since it uses less digits than its factorization.

256396224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27282 (or 27265 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 256396224 is about 16012.3772126440. The cubic root of 256396224 is about 635.2878385888.

The spelling of 256396224 in words is "two hundred fifty-six million, three hundred ninety-six thousand, two hundred twenty-four".