16989664 has 24 divisors (see below), whose sum is σ = 35417088. Its totient is φ = 7994880.

The previous prime is 16989631. The next prime is 16989671. The reversal of 16989664 is 46698961.

It is a congruent number.

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, 15072 + ... + 16159.

It is an arithmetic number, because the mean of its divisors is an integer number (1475712).

Almost surely, 2^16989664 is an apocalyptic number.

It is an amenable number.

16989664 is an abundant number, since it is smaller than the sum of its proper divisors (18427424).

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

16989664 is a wasteful number, since it uses less digits than its factorization.

16989664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31258 (or 31250 counting only the distinct ones).

The product of its digits is 559872, while the sum is 49.

The square root of 16989664 is about 4121.8520109291. The cubic root of 16989664 is about 257.0760371941.

The spelling of 16989664 in words is "sixteen million, nine hundred eighty-nine thousand, six hundred sixty-four".