12566640 has 40 divisors (see below), whose sum is σ = 38957328. Its totient is φ = 3351040.

The previous prime is 12566639. The next prime is 12566647. The reversal of 12566640 is 4666521.

12566640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12566598 and 12566607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12566647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25941 + ... + 26420.

Almost surely, 2^12566640 is an apocalyptic number.

12566640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12566640 is an abundant number, since it is smaller than the sum of its proper divisors (26390688).

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

12566640 is a wasteful number, since it uses less digits than its factorization.

12566640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52377 (or 52371 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 12566640 is about 3544.9456977505. The cubic root of 12566640 is about 232.4911315845.

The spelling of 12566640 in words is "twelve million, five hundred sixty-six thousand, six hundred forty".