12897680 has 20 divisors (see below), whose sum is σ = 29987292. Its totient is φ = 5159040.

The previous prime is 12897667. The next prime is 12897683. The reversal of 12897680 is 8679821.

It can be written as a sum of positive squares in 2 ways, for example, as 6885376 + 6012304 = 2624^2 + 2452^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (12897683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80531 + ... + 80690.

Almost surely, 2^12897680 is an apocalyptic number.

12897680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12897680 is an abundant number, since it is smaller than the sum of its proper divisors (17089612).

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

12897680 is a wasteful number, since it uses less digits than its factorization.

12897680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161234 (or 161228 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 12897680 is about 3591.3340139842. The cubic root of 12897680 is about 234.5149494245.

The spelling of 12897680 in words is "twelve million, eight hundred ninety-seven thousand, six hundred eighty".