12840791640 has 128 divisors (see below), whose sum is σ = 39846643200. Its totient is φ = 3308129280.

The previous prime is 12840791629. The next prime is 12840791671. The reversal of 12840791640 is 4619704821.

It is a junction number, because it is equal to n+sod(n) for n = 12840791592 and 12840791601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 494091 + ... + 519429.

It is an arithmetic number, because the mean of its divisors is an integer number (311301900).

Almost surely, 2^12840791640 is an apocalyptic number.

12840791640 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 12840791640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19923321600).

12840791640 is an abundant number, since it is smaller than the sum of its proper divisors (27005851560).

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

12840791640 is a wasteful number, since it uses less digits than its factorization.

12840791640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25497 (or 25493 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 12840791640 in words is "twelve billion, eight hundred forty million, seven hundred ninety-one thousand, six hundred forty".