16691680 has 24 divisors (see below), whose sum is σ = 39434472. Its totient is φ = 6676608.

The previous prime is 16691659. The next prime is 16691687. The reversal of 16691680 is 8619661.

It is a super-2 number, since 2×16691680² = 557224362444800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16691687) 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, 52002 + ... + 52321.

It is an arithmetic number, because the mean of its divisors is an integer number (1643103).

Almost surely, 2^16691680 is an apocalyptic number.

16691680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16691680 is an abundant number, since it is smaller than the sum of its proper divisors (22742792).

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

16691680 is a wasteful number, since it uses less digits than its factorization.

16691680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104338 (or 104330 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 16691680 is about 4085.5452512486. The cubic root of 16691680 is about 255.5641999456.

It can be divided in two parts, 16691 and 680, that added together give a palindrome (17371).

The spelling of 16691680 in words is "sixteen million, six hundred ninety-one thousand, six hundred eighty".