15681590428 has 12 divisors (see below), whose sum is σ = 31363180912. Its totient is φ = 6720681600.

The previous prime is 15681590369. The next prime is 15681590437. The reversal of 15681590428 is 82409518651.

15681590428 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280028373 + ... + 280028428.

Almost surely, 2^15681590428 is an apocalyptic number.

It is an amenable number.

15681590428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

15681590428 is a wasteful number, since it uses less digits than its factorization.

15681590428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560056812 (or 560056810 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 49.

The spelling of 15681590428 in words is "fifteen billion, six hundred eighty-one million, five hundred ninety thousand, four hundred twenty-eight".