256720324 has 48 divisors (see below), whose sum is σ = 543262720. Its totient is φ = 103692960.

The previous prime is 256720313. The next prime is 256720333. The reversal of 256720324 is 423027652.

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, 111109 + ... + 113395.

Almost surely, 2^256720324 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 256720324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271631360).

256720324 is an abundant number, since it is smaller than the sum of its proper divisors (286542396).

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

256720324 is a wasteful number, since it uses less digits than its factorization.

256720324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528 (or 2526 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 256720324 is about 16022.4943126843. The cubic root of 256720324 is about 635.5554063542. Note that the first 3 decimals are identical.

Adding to 256720324 its reverse (423027652), we get a palindrome (679747976).

The spelling of 256720324 in words is "two hundred fifty-six million, seven hundred twenty thousand, three hundred twenty-four".