16639664 has 10 divisors (see below), whose sum is σ = 32239380. Its totient is φ = 8319824.

The previous prime is 16639657. The next prime is 16639673. The reversal of 16639664 is 46693661.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 519974 + ... + 520005.

It is an arithmetic number, because the mean of its divisors is an integer number (3223938).

Almost surely, 2^16639664 is an apocalyptic number.

It is an amenable number.

16639664 is a deficient number, since it is larger than the sum of its proper divisors (15599716).

16639664 is a wasteful number, since it uses less digits than its factorization.

16639664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039987 (or 1039981 counting only the distinct ones).

The product of its digits is 139968, while the sum is 41.

The square root of 16639664 is about 4079.1744262779. The cubic root of 16639664 is about 255.2984535763.

The spelling of 16639664 in words is "sixteen million, six hundred thirty-nine thousand, six hundred sixty-four".