13915288728 has 80 divisors (see below), whose sum is σ = 42518959560. Its totient is φ = 4216752000.

The previous prime is 13915288693. The next prime is 13915288753. The reversal of 13915288728 is 82788251931.

13915288728 is a `hidden beast` number, since 1 + 3 + 91 + 528 + 8 + 7 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 968973 + ... + 983228.

Almost surely, 2^13915288728 is an apocalyptic number.

13915288728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13915288728 is an abundant number, since it is smaller than the sum of its proper divisors (28603670832).

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

13915288728 is a wasteful number, since it uses less digits than its factorization.

13915288728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952230 (or 1952217 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 13915288728 in words is "thirteen billion, nine hundred fifteen million, two hundred eighty-eight thousand, seven hundred twenty-eight".