12689720 has 64 divisors (see below), whose sum is σ = 30672000. Its totient is φ = 4710528.

The previous prime is 12689711. The next prime is 12689731. The reversal of 12689720 is 2798621.

It is a happy number.

It is a super-2 number, since 2×12689720² = 322057987356800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44699 + ... + 44981.

It is an arithmetic number, because the mean of its divisors is an integer number (479250).

Almost surely, 2^12689720 is an apocalyptic number.

12689720 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 12689720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15336000).

12689720 is an abundant number, since it is smaller than the sum of its proper divisors (17982280).

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

12689720 is a wasteful number, since it uses less digits than its factorization.

12689720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 12689720 is about 3562.2633254716. The cubic root of 12689720 is about 233.2476873880.

The spelling of 12689720 in words is "twelve million, six hundred eighty-nine thousand, seven hundred twenty".