12731107840 has 160 divisors (see below), whose sum is σ = 33435110016. Its totient is φ = 4610703360.

The previous prime is 12731107817. The next prime is 12731107843. The reversal of 12731107840 is 4870113721.

It is a tau number, because it is divible by the number of its divisors (160).

It is a super-2 number, since 2×12731107840² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12731107796 and 12731107805.

It is not an unprimeable number, because it can be changed into a prime (12731107843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8250109 + ... + 8251651.

Almost surely, 2^12731107840 is an apocalyptic number.

12731107840 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 12731107840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16717555008).

12731107840 is an abundant number, since it is smaller than the sum of its proper divisors (20704002176).

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

12731107840 is a wasteful number, since it uses less digits than its factorization.

12731107840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1870 (or 1854 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 34.

The spelling of 12731107840 in words is "twelve billion, seven hundred thirty-one million, one hundred seven thousand, eight hundred forty".