6688990 has 96 divisors (see below), whose sum is σ = 16399584. Its totient is φ = 1935360.

The previous prime is 6688967. The next prime is 6688999. The reversal of 6688990 is 998866.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6688990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6688999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91594 + ... + 91666.

It is an arithmetic number, because the mean of its divisors is an integer number (170829).

Almost surely, 2^6688990 is an apocalyptic number.

6688990 is an abundant number, since it is smaller than the sum of its proper divisors (9710594).

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

6688990 is a wasteful number, since it uses less digits than its factorization.

6688990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 6688990 is about 2586.3081796259. The cubic root of 6688990 is about 188.4170423471.

The spelling of 6688990 in words is "six million, six hundred eighty-eight thousand, nine hundred ninety".