1291708560 has 40 divisors (see below), whose sum is σ = 4004297280. Its totient is φ = 344455552.

The previous prime is 1291708549. The next prime is 1291708619. The reversal of 1291708560 is 658071921.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1291708560² = 3337022007954547200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 2690820 + ... + 2691299.

It is an arithmetic number, because the mean of its divisors is an integer number (100107432).

Almost surely, 2^1291708560 is an apocalyptic number.

1291708560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1291708560 is an abundant number, since it is smaller than the sum of its proper divisors (2712588720).

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

1291708560 is a wasteful number, since it uses less digits than its factorization.

1291708560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5382135 (or 5382129 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 1291708560 is about 35940.3472437315. The cubic root of 1291708560 is about 1089.0676200358.

The spelling of 1291708560 in words is "one billion, two hundred ninety-one million, seven hundred eight thousand, five hundred sixty".