16606404 has 24 divisors (see below), whose sum is σ = 43053920. Its totient is φ = 5535432.

The previous prime is 16606397. The next prime is 16606423. The reversal of 16606404 is 40460661.

16606404 is a `hidden beast` number, since 16 + 6 + 0 + 640 + 4 = 666.

It is a super-2 number, since 2×16606404² = 551545307622432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 7 ways as a sum of consecutive naturals, for example, 76774 + ... + 76989.

Almost surely, 2^16606404 is an apocalyptic number.

It is an amenable number.

16606404 is an abundant number, since it is smaller than the sum of its proper divisors (26447516).

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

16606404 is a wasteful number, since it uses less digits than its factorization.

16606404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153776 (or 153768 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 16606404 is about 4075.0955817011. The cubic root of 16606404 is about 255.1282399953.

The spelling of 16606404 in words is "sixteen million, six hundred six thousand, four hundred four".