16656628 has 12 divisors (see below), whose sum is σ = 29699460. Its totient is φ = 8171072.

The previous prime is 16656593. The next prime is 16656631. The reversal of 16656628 is 82665661.

It can be written as a sum of positive squares in 2 ways, for example, as 14961424 + 1695204 = 3868^2 + 1302^2 .

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, 39073 + ... + 39496.

It is an arithmetic number, because the mean of its divisors is an integer number (2474955).

Almost surely, 2^16656628 is an apocalyptic number.

It is an amenable number.

16656628 is a deficient number, since it is larger than the sum of its proper divisors (13042832).

16656628 is a wasteful number, since it uses less digits than its factorization.

16656628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78626 (or 78624 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 16656628 is about 4081.2532388961. The cubic root of 16656628 is about 255.3851823314.

The spelling of 16656628 in words is "sixteen million, six hundred fifty-six thousand, six hundred twenty-eight".