13235472640 has 144 divisors (see below), whose sum is σ = 34416119808. Its totient is φ = 4847689728.

The previous prime is 13235472631. The next prime is 13235472641. The reversal of 13235472640 is 4627453231.

It is a self number, because there is not a number n which added to its sum of digits gives 13235472640.

It is not an unprimeable number, because it can be changed into a prime (13235472641) 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, 2110149 + ... + 2116411.

It is an arithmetic number, because the mean of its divisors is an integer number (239000832).

Almost surely, 2^13235472640 is an apocalyptic number.

13235472640 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 13235472640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17208059904).

13235472640 is an abundant number, since it is smaller than the sum of its proper divisors (21180647168).

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

13235472640 is a wasteful number, since it uses less digits than its factorization.

13235472640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6424 (or 6410 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 37.

The spelling of 13235472640 in words is "thirteen billion, two hundred thirty-five million, four hundred seventy-two thousand, six hundred forty".