16631728 has 20 divisors (see below), whose sum is σ = 32407648. Its totient is φ = 8268480.

The previous prime is 16631723. The next prime is 16631731. The reversal of 16631728 is 82713661.

It is a super-2 number, since 2×16631728² = 553228752531968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16631693 and 16631702.

It is not an unprimeable number, because it can be changed into a prime (16631723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25 + ... + 5767.

Almost surely, 2^16631728 is an apocalyptic number.

It is an amenable number.

16631728 is a deficient number, since it is larger than the sum of its proper divisors (15775920).

16631728 is a wasteful number, since it uses less digits than its factorization.

16631728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5932 (or 5926 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 16631728 is about 4078.2015644154. The cubic root of 16631728 is about 255.2578603947.

The spelling of 16631728 in words is "sixteen million, six hundred thirty-one thousand, seven hundred twenty-eight".