16668690 has 32 divisors (see below), whose sum is σ = 40271040. Its totient is φ = 4415424.

The previous prime is 16668683. The next prime is 16668697. The reversal of 16668690 is 9686661.

16668690 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16668683) and next prime (16668697).

It is a super-2 number, since 2×16668690² = 555690452632200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16668697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2941 + ... + 6479.

It is an arithmetic number, because the mean of its divisors is an integer number (1258470).

Almost surely, 2^16668690 is an apocalyptic number.

16668690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16668690 is an abundant number, since it is smaller than the sum of its proper divisors (23602350).

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

16668690 is a wasteful number, since it uses less digits than its factorization.

16668690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3706.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 16668690 is about 4082.7307038305. The cubic root of 16668690 is about 255.4468137090.

The spelling of 16668690 in words is "sixteen million, six hundred sixty-eight thousand, six hundred ninety".