12691560 has 128 divisors (see below), whose sum is σ = 45100800. Its totient is φ = 2795520.

The previous prime is 12691541. The next prime is 12691583. The reversal of 12691560 is 6519621.

It is a super-2 number, since 2×12691560² = 322151390467200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24100 + ... + 24620.

It is an arithmetic number, because the mean of its divisors is an integer number (352350).

Almost surely, 2^12691560 is an apocalyptic number.

12691560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12691560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22550400).

12691560 is an abundant number, since it is smaller than the sum of its proper divisors (32409240).

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

12691560 is a wasteful number, since it uses less digits than its factorization.

12691560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 12691560 is about 3562.5215788820. The cubic root of 12691560 is about 233.2589604238.

The spelling of 12691560 in words is "twelve million, six hundred ninety-one thousand, five hundred sixty".