16663728 has 20 divisors (see below), whose sum is σ = 43048088. Its totient is φ = 5554560.

The previous prime is 16663697. The next prime is 16663763. The reversal of 16663728 is 82736661.

16663728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 173533 + ... + 173628.

Almost surely, 2^16663728 is an apocalyptic number.

It is an amenable number.

16663728 is an abundant number, since it is smaller than the sum of its proper divisors (26384360).

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

16663728 is a wasteful number, since it uses less digits than its factorization.

16663728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347172 (or 347166 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 16663728 is about 4082.1229770795. The cubic root of 16663728 is about 255.4214637288.

It can be divided in two parts, 16663 and 728, that added together give a triangular number (17391 = T₁₈₆).

The spelling of 16663728 in words is "sixteen million, six hundred sixty-three thousand, seven hundred twenty-eight".