13503432720 has 40 divisors (see below), whose sum is σ = 41860642176. Its totient is φ = 3600915328.

The previous prime is 13503432647. The next prime is 13503432727. The reversal of 13503432720 is 2723430531.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (13503432727) 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, 28131912 + ... + 28132391.

Almost surely, 2^13503432720 is an apocalyptic number.

13503432720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13503432720 is an abundant number, since it is smaller than the sum of its proper divisors (28357209456).

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

13503432720 is a wasteful number, since it uses less digits than its factorization.

13503432720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56264319 (or 56264313 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 30.

The spelling of 13503432720 in words is "thirteen billion, five hundred three million, four hundred thirty-two thousand, seven hundred twenty".