16993280 has 44 divisors (see below), whose sum is σ = 40776240. Its totient is φ = 6795264.

The previous prime is 16993267. The next prime is 16993283. The reversal of 16993280 is 8239961.

It is not an unprimeable number, because it can be changed into a prime (16993283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3461 + ... + 6779.

Almost surely, 2^16993280 is an apocalyptic number.

16993280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16993280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20388120).

16993280 is an abundant number, since it is smaller than the sum of its proper divisors (23782960).

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

16993280 is an equidigital number, since it uses as much as digits as its factorization.

16993280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344 (or 3326 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 16993280 is about 4122.2906253684. The cubic root of 16993280 is about 257.0942741843.

The spelling of 16993280 in words is "sixteen million, nine hundred ninety-three thousand, two hundred eighty".