256111320 has 32 divisors (see below), whose sum is σ = 768334320. Its totient is φ = 68296320.

The previous prime is 256111313. The next prime is 256111337. The reversal of 256111320 is 23111652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1067011 + ... + 1067250.

Almost surely, 2^256111320 is an apocalyptic number.

256111320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256111320 is an abundant number, since it is smaller than the sum of its proper divisors (512223000).

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

256111320 is a wasteful number, since it uses less digits than its factorization.

256111320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134275 (or 2134271 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 256111320 is about 16003.4783719040. The cubic root of 256111320 is about 635.0524436402.

Adding to 256111320 its reverse (23111652), we get a palindrome (279222972).

The spelling of 256111320 in words is "two hundred fifty-six million, one hundred eleven thousand, three hundred twenty".