16881816 has 128 divisors (see below), whose sum is σ = 53498880. Its totient is φ = 4325376.

The previous prime is 16881779. The next prime is 16881827. The reversal of 16881816 is 61818861.

It is a super-2 number, since 2×16881816² = 569991422915712, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65560 + ... + 65816.

It is an arithmetic number, because the mean of its divisors is an integer number (417960).

Almost surely, 2^16881816 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 16881816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26749440).

16881816 is an abundant number, since it is smaller than the sum of its proper divisors (36617064).

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

16881816 is a wasteful number, since it uses less digits than its factorization.

16881816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 309 counting only the distinct ones).

The product of its digits is 18432, while the sum is 39.

The square root of 16881816 is about 4108.7487146332. The cubic root of 16881816 is about 256.5309212672.

The spelling of 16881816 in words is "sixteen million, eight hundred eighty-one thousand, eight hundred sixteen".