12640725 has 48 divisors (see below), whose sum is σ = 23679040. Its totient is φ = 6609600.

The previous prime is 12640709. The next prime is 12640763. The reversal of 12640725 is 52704621.

12640725 is a `hidden beast` number, since 12 + 640 + 7 + 2 + 5 = 666.

12640725 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12640725 - 2⁴ = 12640709 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41022 + ... + 41328.

Almost surely, 2^12640725 is an apocalyptic number.

12640725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12640725 is a deficient number, since it is larger than the sum of its proper divisors (11038315).

12640725 is a wasteful number, since it uses less digits than its factorization.

12640725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 12640725 is about 3555.3797265552. The cubic root of 12640725 is about 232.9471104941.

The spelling of 12640725 in words is "twelve million, six hundred forty thousand, seven hundred twenty-five".