13903840728 has 64 divisors (see below), whose sum is σ = 40893660000. Its totient is φ = 4361988096.

The previous prime is 13903840651. The next prime is 13903840733. The reversal of 13903840728 is 82704830931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1889553 + ... + 1896896.

Almost surely, 2^13903840728 is an apocalyptic number.

13903840728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13903840728 is an abundant number, since it is smaller than the sum of its proper divisors (26989819272).

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

13903840728 is a wasteful number, since it uses less digits than its factorization.

13903840728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3786481 (or 3786471 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 13903840728 in words is "thirteen billion, nine hundred three million, eight hundred forty thousand, seven hundred twenty-eight".