16689472 has 14 divisors (see below), whose sum is σ = 33118298. Its totient is φ = 8344704.

The previous prime is 16689443. The next prime is 16689481. The reversal of 16689472 is 27498661.

16689472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 15872256 + 817216 = 3984^2 + 904^2 .

It is a nialpdrome in base 4 and base 16.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130323 + ... + 130450.

Almost surely, 2^16689472 is an apocalyptic number.

It is an amenable number.

16689472 is a deficient number, since it is larger than the sum of its proper divisors (16428826).

16689472 is an equidigital number, since it uses as much as digits as its factorization.

16689472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260785 (or 260775 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 16689472 is about 4085.2750213419. The cubic root of 16689472 is about 255.5529306459.

It can be divided in two parts, 16689 and 472, that added together give a square (17161 = 131²).

The spelling of 16689472 in words is "sixteen million, six hundred eighty-nine thousand, four hundred seventy-two".