12640624340 has 12 divisors (see below), whose sum is σ = 26545311156. Its totient is φ = 5056249728.

The previous prime is 12640624279. The next prime is 12640624369. The reversal of 12640624340 is 4342604621.

It can be written as a sum of positive squares in 2 ways, for example, as 5652333124 + 6988291216 = 75182^2 + 83596^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 12640624297 and 12640624306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316015589 + ... + 316015628.

It is an arithmetic number, because the mean of its divisors is an integer number (2212109263).

Almost surely, 2^12640624340 is an apocalyptic number.

12640624340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12640624340 is an abundant number, since it is smaller than the sum of its proper divisors (13904686816).

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

12640624340 is a wasteful number, since it uses less digits than its factorization.

12640624340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632031226 (or 632031224 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The spelling of 12640624340 in words is "twelve billion, six hundred forty million, six hundred twenty-four thousand, three hundred forty".