6689889 has 6 divisors (see below), whose sum is σ = 9663186. Its totient is φ = 4459920.

The previous prime is 6689873. The next prime is 6689909. The reversal of 6689889 is 9889866.

6689889 is digitally balanced in base 3, 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., 6656400 + 33489 = 2580^2 + 183^2 .

It is not a de Polignac number, because 6689889 - 2⁴ = 6689873 is a prime.

It is a super-2 number, since 2×6689889² = 89509229664642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6689869) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 371652 + ... + 371669.

It is an arithmetic number, because the mean of its divisors is an integer number (1610531).

Almost surely, 2^6689889 is an apocalyptic number.

It is an amenable number.

6689889 is a deficient number, since it is larger than the sum of its proper divisors (2973297).

6689889 is a wasteful number, since it uses less digits than its factorization.

6689889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743327 (or 743324 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 6689889 is about 2586.4819736468. The cubic root of 6689889 is about 188.4254830501.

The spelling of 6689889 in words is "six million, six hundred eighty-nine thousand, eight hundred eighty-nine".