1264892656 has 20 divisors (see below), whose sum is σ = 2516966632. Its totient is φ = 615352896.

The previous prime is 1264892627. The next prime is 1264892677. The reversal of 1264892656 is 6562984621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067730 + ... + 1068913.

Almost surely, 2^1264892656 is an apocalyptic number.

1264892656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1264892656 is a deficient number, since it is larger than the sum of its proper divisors (1252073976).

1264892656 is a wasteful number, since it uses less digits than its factorization.

1264892656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136688 (or 2136682 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

The square root of 1264892656 is about 35565.3294094122. The cubic root of 1264892656 is about 1081.4785008694.

The spelling of 1264892656 in words is "one billion, two hundred sixty-four million, eight hundred ninety-two thousand, six hundred fifty-six".