13909251928 has 64 divisors (see below), whose sum is σ = 30662906400. Its totient is φ = 5831546880.

The previous prime is 13909251919. The next prime is 13909251949. The reversal of 13909251928 is 82915290931.

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, 1772718 + ... + 1780546.

Almost surely, 2^13909251928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13909251928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15331453200).

13909251928 is an abundant number, since it is smaller than the sum of its proper divisors (16753654472).

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

13909251928 is a wasteful number, since it uses less digits than its factorization.

13909251928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9412 (or 9408 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 49.

The spelling of 13909251928 in words is "thirteen billion, nine hundred nine million, two hundred fifty-one thousand, nine hundred twenty-eight".