12643880 has 16 divisors (see below), whose sum is σ = 28448820. Its totient is φ = 5057536.

The previous prime is 12643879. The next prime is 12643889. The reversal of 12643880 is 8834621.

It can be written as a sum of positive squares in 2 ways, for example, as 10278436 + 2365444 = 3206^2 + 1538^2 .

It is not an unprimeable number, because it can be changed into a prime (12643889) 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, 158009 + ... + 158088.

Almost surely, 2^12643880 is an apocalyptic number.

12643880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12643880 is an abundant number, since it is smaller than the sum of its proper divisors (15804940).

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

12643880 is a wasteful number, since it uses less digits than its factorization.

12643880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316108 (or 316104 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 12643880 is about 3555.8233926898. The cubic root of 12643880 is about 232.9664893139.

The spelling of 12643880 in words is "twelve million, six hundred forty-three thousand, eight hundred eighty".