12640870 has 48 divisors (see below), whose sum is σ = 25893504. Its totient is φ = 4435200.

The previous prime is 12640867. The next prime is 12640879. The reversal of 12640870 is 7804621.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640879) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37342 + ... + 37678.

It is an arithmetic number, because the mean of its divisors is an integer number (539448).

Almost surely, 2^12640870 is an apocalyptic number.

12640870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12640870 is an abundant number, since it is smaller than the sum of its proper divisors (13252634).

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

12640870 is a wasteful number, since it uses less digits than its factorization.

12640870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 12640870 is about 3555.4001181302. The cubic root of 12640870 is about 232.9480011920.

The spelling of 12640870 in words is "twelve million, six hundred forty thousand, eight hundred seventy".