15990428 has 24 divisors (see below), whose sum is σ = 29393280. Its totient is φ = 7597040.

The previous prime is 15990427. The next prime is 15990433. The reversal of 15990428 is 82409951.

It is a junction number, because it is equal to n+sod(n) for n = 15990391 and 15990400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15990427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15983 + ... + 16953.

It is an arithmetic number, because the mean of its divisors is an integer number (1224720).

Almost surely, 2^15990428 is an apocalyptic number.

It is an amenable number.

15990428 is a deficient number, since it is larger than the sum of its proper divisors (13402852).

15990428 is a wasteful number, since it uses less digits than its factorization.

15990428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177 (or 1175 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 15990428 is about 3998.8033209949. The cubic root of 15990428 is about 251.9339501038.

The spelling of 15990428 in words is "fifteen million, nine hundred ninety thousand, four hundred twenty-eight".