13500072440 has 32 divisors (see below), whose sum is σ = 30527820000. Its totient is φ = 5372889984.

The previous prime is 13500072409. The next prime is 13500072449. The reversal of 13500072440 is 4427000531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13500072449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840035 + ... + 855954.

It is an arithmetic number, because the mean of its divisors is an integer number (953994375).

Almost surely, 2^13500072440 is an apocalyptic number.

13500072440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13500072440 is an abundant number, since it is smaller than the sum of its proper divisors (17027747560).

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

13500072440 is a wasteful number, since it uses less digits than its factorization.

13500072440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696199 (or 1696195 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

Adding to 13500072440 its reverse (4427000531), we get a palindrome (17927072971).

The spelling of 13500072440 in words is "thirteen billion, five hundred million, seventy-two thousand, four hundred forty".