12615640 has 32 divisors (see below), whose sum is σ = 28602000. Its totient is φ = 5007744.

The previous prime is 12615623. The next prime is 12615653. The reversal of 12615640 is 4651621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4426 + ... + 6694.

Almost surely, 2^12615640 is an apocalyptic number.

12615640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12615640 is an abundant number, since it is smaller than the sum of its proper divisors (15986360).

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

12615640 is a wasteful number, since it uses less digits than its factorization.

12615640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419 (or 2415 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 12615640 is about 3551.8502220674. The cubic root of 12615640 is about 232.7929171253.

The spelling of 12615640 in words is "twelve million, six hundred fifteen thousand, six hundred forty".