12449639720 has 48 divisors (see below), whose sum is σ = 32585031540. Its totient is φ = 4268447232.

The previous prime is 12449639717. The next prime is 12449639729. The reversal of 12449639720 is 2793694421.

It can be written as a sum of positive squares in 2 ways, for example, as 12260247076 + 189392644 = 110726^2 + 13762^2 .

It is not an unprimeable number, because it can be changed into a prime (12449639729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3173969 + ... + 3177888.

Almost surely, 2^12449639720 is an apocalyptic number.

12449639720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12449639720 is an abundant number, since it is smaller than the sum of its proper divisors (20135391820).

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

12449639720 is a wasteful number, since it uses less digits than its factorization.

12449639720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6351882 (or 6351871 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 12449639720 in words is "twelve billion, four hundred forty-nine million, six hundred thirty-nine thousand, seven hundred twenty".