1256312868 has 12 divisors (see below), whose sum is σ = 2931396720. Its totient is φ = 418770952.

The previous prime is 1256312861. The next prime is 1256312881. The reversal of 1256312868 is 8682136521.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1256312861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52346358 + ... + 52346381.

It is an arithmetic number, because the mean of its divisors is an integer number (244283060).

Almost surely, 2^1256312868 is an apocalyptic number.

It is an amenable number.

1256312868 is an abundant number, since it is smaller than the sum of its proper divisors (1675083852).

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

1256312868 is a wasteful number, since it uses less digits than its factorization.

1256312868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104692746 (or 104692744 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 1256312868 is about 35444.5040591627. The cubic root of 1256312868 is about 1079.0277223565.

The spelling of 1256312868 in words is "one billion, two hundred fifty-six million, three hundred twelve thousand, eight hundred sixty-eight".