16689888 has 120 divisors (see below), whose sum is σ = 50494752. Its totient is φ = 5405184.

The previous prime is 16689887. The next prime is 16689913. The reversal of 16689888 is 88898661.

It is a super-2 number, since 2×16689888² = 557104722905088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16689887) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 121756 + ... + 121892.

Almost surely, 2^16689888 is an apocalyptic number.

16689888 is a gapful number since it is divisible by the number (18) 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 16689888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25247376).

16689888 is an abundant number, since it is smaller than the sum of its proper divisors (33804864).

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

16689888 is a wasteful number, since it uses less digits than its factorization.

16689888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 189 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The square root of 16689888 is about 4085.3259355895. The cubic root of 16689888 is about 255.5550539233. Note that the first 3 decimals are identical.

The spelling of 16689888 in words is "sixteen million, six hundred eighty-nine thousand, eight hundred eighty-eight".