1317656880 has 60 divisors (see below), whose sum is σ = 4425133440. Its totient is φ = 351374976.

The previous prime is 1317656861. The next prime is 1317656909. The reversal of 1317656880 is 886567131.

1317656880 is a `hidden beast` number, since 1 + 3 + 1 + 7 + 6 + 568 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×1317656880² = 3472439306822668800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 914320 + ... + 915759.

It is an arithmetic number, because the mean of its divisors is an integer number (73752224).

Almost surely, 2^1317656880 is an apocalyptic number.

1317656880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1317656880 is an abundant number, since it is smaller than the sum of its proper divisors (3107476560).

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

1317656880 is a wasteful number, since it uses less digits than its factorization.

1317656880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830098 (or 1830089 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1317656880 is about 36299.5437987862. The cubic root of 1317656880 is about 1096.3118573721.

The spelling of 1317656880 in words is "one billion, three hundred seventeen million, six hundred fifty-six thousand, eight hundred eighty".