12640875340 has 24 divisors (see below), whose sum is σ = 26547983280. Its totient is φ = 5055941568.

The previous prime is 12640875229. The next prime is 12640875343. The reversal of 12640875340 is 4357804621.

It is a super-2 number, since 2×12640875340² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12640875293 and 12640875302.

It is not an unprimeable number, because it can be changed into a prime (12640875343) 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, 406174 + ... + 436186.

It is an arithmetic number, because the mean of its divisors is an integer number (1106165970).

Almost surely, 2^12640875340 is an apocalyptic number.

12640875340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12640875340 is an abundant number, since it is smaller than the sum of its proper divisors (13907107940).

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

12640875340 is a wasteful number, since it uses less digits than its factorization.

12640875340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51081 (or 51079 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 12640875340 in words is "twelve billion, six hundred forty million, eight hundred seventy-five thousand, three hundred forty".