256281312 has 48 divisors (see below), whose sum is σ = 768845952. Its totient is φ = 73223040.

The previous prime is 256281299. The next prime is 256281343. The reversal of 256281312 is 213182652.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×256281312² = 131360221760882688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256281312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190014 + ... + 191357.

It is an arithmetic number, because the mean of its divisors is an integer number (16017624).

Almost surely, 2^256281312 is an apocalyptic number.

It is an amenable number.

256281312 is an abundant number, since it is smaller than the sum of its proper divisors (512564640).

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

256281312 is a wasteful number, since it uses less digits than its factorization.

256281312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381391 (or 381383 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 256281312 is about 16008.7885862735. The cubic root of 256281312 is about 635.1929163577.

The spelling of 256281312 in words is "two hundred fifty-six million, two hundred eighty-one thousand, three hundred twelve".