16664690 has 32 divisors (see below), whose sum is σ = 34435584. Its totient is φ = 5688000.

The previous prime is 16664677. The next prime is 16664731. The reversal of 16664690 is 9646661.

It is a super-2 number, since 2×16664690² = 555423785592200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21815 + ... + 22565.

It is an arithmetic number, because the mean of its divisors is an integer number (1076112).

Almost surely, 2^16664690 is an apocalyptic number.

16664690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16664690 is an abundant number, since it is smaller than the sum of its proper divisors (17770894).

16664690 is a wasteful number, since it uses less digits than its factorization.

16664690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 16664690 is about 4082.2408062240. The cubic root of 16664690 is about 255.4263788099.

The spelling of 16664690 in words is "sixteen million, six hundred sixty-four thousand, six hundred ninety".