16890816 has 28 divisors (see below), whose sum is σ = 44690792. Its totient is φ = 5630208.

The previous prime is 16890799. The next prime is 16890817. The reversal of 16890816 is 61809861.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16890817) 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, 43795 + ... + 44178.

Almost surely, 2^16890816 is an apocalyptic number.

16890816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16890816 is an abundant number, since it is smaller than the sum of its proper divisors (27799976).

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

16890816 is an equidigital number, since it uses as much as digits as its factorization.

16890816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87988 (or 87978 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 16890816 is about 4109.8437926520. The cubic root of 16890816 is about 256.5765002525.

The spelling of 16890816 in words is "sixteen million, eight hundred ninety thousand, eight hundred sixteen".