12549904640 has 288 divisors, whose sum is σ = 37281382656. Its totient is φ = 3941498880.

The previous prime is 12549904597. The next prime is 12549904649. The reversal of 12549904640 is 4640994521.

It is a junction number, because it is equal to n+sod(n) for n = 12549904591 and 12549904600.

It is not an unprimeable number, because it can be changed into a prime (12549904649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18985910 + ... + 18986570.

Almost surely, 2^12549904640 is an apocalyptic number.

12549904640 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 12549904640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18640691328).

12549904640 is an abundant number, since it is smaller than the sum of its proper divisors (24731478016).

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

12549904640 is a wasteful number, since it uses less digits than its factorization.

12549904640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865 (or 851 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 12549904640 in words is "twelve billion, five hundred forty-nine million, nine hundred four thousand, six hundred forty".