6687690 has 32 divisors (see below), whose sum is σ = 16606080. Its totient is φ = 1721664.

The previous prime is 6687689. The next prime is 6687701. The reversal of 6687690 is 967866.

It is a happy number.

It is a super-2 number, since 2×6687690² = 89450395072200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2974 + ... + 4713.

It is an arithmetic number, because the mean of its divisors is an integer number (518940).

Almost surely, 2^6687690 is an apocalyptic number.

6687690 is an abundant number, since it is smaller than the sum of its proper divisors (9918390).

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

6687690 is a wasteful number, since it uses less digits than its factorization.

6687690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7726.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 6687690 is about 2586.0568439228. The cubic root of 6687690 is about 188.4048353211.

It can be divided in two parts, 66876 and 90, that added together give a palindrome (66966).

The spelling of 6687690 in words is "six million, six hundred eighty-seven thousand, six hundred ninety".