13039678640 has 80 divisors (see below), whose sum is σ = 32151968928. Its totient is φ = 4901203968.

The previous prime is 13039678621. The next prime is 13039678643. The reversal of 13039678640 is 4687693031.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (13039678643) 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, 880739 + ... + 895421.

Almost surely, 2^13039678640 is an apocalyptic number.

13039678640 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 13039678640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16075984464).

13039678640 is an abundant number, since it is smaller than the sum of its proper divisors (19112290288).

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

13039678640 is a wasteful number, since it uses less digits than its factorization.

13039678640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15366 (or 15360 counting only the distinct ones).

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

The spelling of 13039678640 in words is "thirteen billion, thirty-nine million, six hundred seventy-eight thousand, six hundred forty".