16668828 has 72 divisors (see below), whose sum is σ = 47698560. Its totient is φ = 5047920.

The previous prime is 16668809. The next prime is 16668851. The reversal of 16668828 is 82886661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9913 + ... + 11471.

It is an arithmetic number, because the mean of its divisors is an integer number (662480).

Almost surely, 2^16668828 is an apocalyptic number.

16668828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16668828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23849280).

16668828 is an abundant number, since it is smaller than the sum of its proper divisors (31029732).

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

16668828 is a wasteful number, since it uses less digits than its factorization.

16668828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589 (or 1575 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 16668828 is about 4082.7476042489. The cubic root of 16668828 is about 255.4475186547.

The spelling of 16668828 in words is "sixteen million, six hundred sixty-eight thousand, eight hundred twenty-eight".