16991968 has 48 divisors (see below), whose sum is σ = 39481344. Its totient is φ = 7044480.

The previous prime is 16991951. The next prime is 16992007. The reversal of 16991968 is 86919961.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5721 + ... + 8167.

It is an arithmetic number, because the mean of its divisors is an integer number (822528).

Almost surely, 2^16991968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16991968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19740672).

16991968 is an abundant number, since it is smaller than the sum of its proper divisors (22489376).

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

16991968 is a wasteful number, since it uses less digits than its factorization.

16991968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495 (or 2487 counting only the distinct ones).

The product of its digits is 209952, while the sum is 49.

The square root of 16991968 is about 4122.1314874710. The cubic root of 16991968 is about 257.0876575224.

The spelling of 16991968 in words is "sixteen million, nine hundred ninety-one thousand, nine hundred sixty-eight".