16621928 has 16 divisors (see below), whose sum is σ = 31212000. Its totient is φ = 8298736.

The previous prime is 16621897. The next prime is 16621949. The reversal of 16621928 is 82912661.

It is a Cunningham number, because it is equal to 4077²-1.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7133 + ... + 9171.

It is an arithmetic number, because the mean of its divisors is an integer number (1950750).

Almost surely, 2^16621928 is an apocalyptic number.

It is an amenable number.

16621928 is a deficient number, since it is larger than the sum of its proper divisors (14590072).

16621928 is a wasteful number, since it uses less digits than its factorization.

16621928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3064 (or 3060 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 16621928 is about 4076.9998773608. Note that the first 3 decimals coincide. The cubic root of 16621928 is about 255.2077149032.

The spelling of 16621928 in words is "sixteen million, six hundred twenty-one thousand, nine hundred twenty-eight".