12643031620 has 24 divisors (see below), whose sum is σ = 26576112024. Its totient is φ = 5052308736.

The previous prime is 12643031617. The next prime is 12643031627. The reversal of 12643031620 is 2613034621.

It can be written as a sum of positive squares in 4 ways, for example, as 3275501824 + 9367529796 = 57232^2 + 96786^2 .

It is not an unprimeable number, because it can be changed into a prime (12643031627) 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, 285319 + ... + 326638.

It is an arithmetic number, because the mean of its divisors is an integer number (1107338001).

Almost surely, 2^12643031620 is an apocalyptic number.

12643031620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12643031620 is an abundant number, since it is smaller than the sum of its proper divisors (13933080404).

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

12643031620 is a wasteful number, since it uses less digits than its factorization.

12643031620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612999 (or 612997 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 12643031620 in words is "twelve billion, six hundred forty-three million, thirty-one thousand, six hundred twenty".