13040502640 has 80 divisors (see below), whose sum is σ = 33882268896. Its totient is φ = 4626329600.

The previous prime is 13040502623. The next prime is 13040502649. The reversal of 13040502640 is 4620504031.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13040502649) 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, 144637 + ... + 216796.

Almost surely, 2^13040502640 is an apocalyptic number.

13040502640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13040502640 is an abundant number, since it is smaller than the sum of its proper divisors (20841766256).

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

13040502640 is a wasteful number, since it uses less digits than its factorization.

13040502640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361498 (or 361492 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 13040502640 in words is "thirteen billion, forty million, five hundred two thousand, six hundred forty".