12731376640 has 88 divisors (see below), whose sum is σ = 30909372480. Its totient is φ = 5031026688.

The previous prime is 12731376631. The next prime is 12731376659. The reversal of 12731376640 is 4667313721.

It is a super-2 number, since 2×12731376640² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 12731376593 and 12731376602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409981 + ... + 439939.

Almost surely, 2^12731376640 is an apocalyptic number.

12731376640 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 12731376640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15454686240).

12731376640 is an abundant number, since it is smaller than the sum of its proper divisors (18177995840).

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

12731376640 is an equidigital number, since it uses as much as digits as its factorization.

12731376640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30067 (or 30049 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 40.

The spelling of 12731376640 in words is "twelve billion, seven hundred thirty-one million, three hundred seventy-six thousand, six hundred forty".