15990222928 has 20 divisors (see below), whose sum is σ = 31141586548. Its totient is φ = 7953684480.

The previous prime is 15990222887. The next prime is 15990222943. The reversal of 15990222928 is 82922209951.

It can be written as a sum of positive squares in 2 ways, for example, as 10921922064 + 5068300864 = 104508^2 + 71192^2 .

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, 2586003 + ... + 2592178.

Almost surely, 2^15990222928 is an apocalyptic number.

It is an amenable number.

15990222928 is a deficient number, since it is larger than the sum of its proper divisors (15151363620).

15990222928 is a wasteful number, since it uses less digits than its factorization.

15990222928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5178382 (or 5178376 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 15990222928 in words is "fifteen billion, nine hundred ninety million, two hundred twenty-two thousand, nine hundred twenty-eight".