16688660 has 12 divisors (see below), whose sum is σ = 35046228. Its totient is φ = 6675456.

The previous prime is 16688647. The next prime is 16688677. The reversal of 16688660 is 6688661.

It can be written as a sum of positive squares in 2 ways, for example, as 5626384 + 11062276 = 2372^2 + 3326^2 .

It is a super-2 number, since 2×16688660² = 557022745191200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417197 + ... + 417236.

It is an arithmetic number, because the mean of its divisors is an integer number (2920519).

Almost surely, 2^16688660 is an apocalyptic number.

16688660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16688660 is an abundant number, since it is smaller than the sum of its proper divisors (18357568).

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

16688660 is a wasteful number, since it uses less digits than its factorization.

16688660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834442 (or 834440 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 16688660 is about 4085.1756388190. The cubic root of 16688660 is about 255.5487860701.

Subtracting from 16688660 its reverse (6688661), we obtain a palindrome (9999999).

The spelling of 16688660 in words is "sixteen million, six hundred eighty-eight thousand, six hundred sixty".