12691080 has 80 divisors (see below), whose sum is σ = 42667020. Its totient is φ = 3383424.

The previous prime is 12691079. The next prime is 12691087. The reversal of 12691080 is 8019621.

It can be written as a sum of positive squares in 2 ways, for example, as 12574116 + 116964 = 3546^2 + 342^2 .

It is a super-2 number, since 2×12691080² = 322127023132800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12691087) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1282 + ... + 5198.

Almost surely, 2^12691080 is an apocalyptic number.

12691080 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 12691080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21333510).

12691080 is an abundant number, since it is smaller than the sum of its proper divisors (29975940).

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

12691080 is a wasteful number, since it uses less digits than its factorization.

12691080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940 (or 3927 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 12691080 is about 3562.4542102320. The cubic root of 12691080 is about 233.2560197369.

The spelling of 12691080 in words is "twelve million, six hundred ninety-one thousand, eighty".