12640860 has 144 divisors (see below), whose sum is σ = 42292320. Its totient is φ = 3172608.

The previous prime is 12640841. The next prime is 12640867. The reversal of 12640860 is 6804621.

12640860 is a `hidden beast` number, since 12 + 640 + 8 + 6 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640867) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 743572 + ... + 743588.

It is a vampire number, since it can be written as 2601 ⋅ 4860 (with its own digits).

Almost surely, 2^12640860 is an apocalyptic number.

12640860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12640860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21146160).

12640860 is an abundant number, since it is smaller than the sum of its proper divisors (29651460).

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

12640860 is an equidigital number, since it uses as much as digits as its factorization.

12640860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64 (or 27 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 12640860 is about 3555.3987118184. The cubic root of 12640860 is about 232.9479397647.

The spelling of 12640860 in words is "twelve million, six hundred forty thousand, eight hundred sixty".