16669890 has 24 divisors (see below), whose sum is σ = 43341948. Its totient is φ = 4445280.

The previous prime is 16669889. The next prime is 16669927. The reversal of 16669890 is 9896661.

It can be written as a sum of positive squares in 2 ways, for example, as 16621929 + 47961 = 4077^2 + 219^2 .

It is a super-2 number, since 2×16669890² = 555770465224200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92521 + ... + 92700.

Almost surely, 2^16669890 is an apocalyptic number.

16669890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16669890 is an abundant number, since it is smaller than the sum of its proper divisors (26672058).

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

16669890 is a wasteful number, since it uses less digits than its factorization.

16669890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185234 (or 185231 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 16669890 is about 4082.8776616499. The cubic root of 16669890 is about 255.4529435413.

The spelling of 16669890 in words is "sixteen million, six hundred sixty-nine thousand, eight hundred ninety".