16621712 has 20 divisors (see below), whose sum is σ = 32327916. Its totient is φ = 8279040.

The previous prime is 16621681. The next prime is 16621721. The reversal of 16621712 is 21712661.

It can be written as a sum of positive squares in 2 ways, for example, as 5837056 + 10784656 = 2416^2 + 3284^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2648 + ... + 6344.

Almost surely, 2^16621712 is an apocalyptic number.

It is an amenable number.

16621712 is a deficient number, since it is larger than the sum of its proper divisors (15706204).

16621712 is a wasteful number, since it uses less digits than its factorization.

16621712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986 (or 3980 counting only the distinct ones).

The product of its digits is 1008, while the sum is 26.

The square root of 16621712 is about 4076.9733872077. The cubic root of 16621712 is about 255.2066094337.

The spelling of 16621712 in words is "sixteen million, six hundred twenty-one thousand, seven hundred twelve".