6688775 has 6 divisors (see below), whose sum is σ = 8294112. Its totient is φ = 5351000.

The previous prime is 6688757. The next prime is 6688783. The reversal of 6688775 is 5778866.

It is not a de Polignac number, because 6688775 - 2⁸ = 6688519 is a prime.

It is a super-2 number, since 2×6688775² = 89479422001250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 133751 + ... + 133800.

It is an arithmetic number, because the mean of its divisors is an integer number (1382352).

Almost surely, 2^6688775 is an apocalyptic number.

6688775 is a deficient number, since it is larger than the sum of its proper divisors (1605337).

6688775 is a wasteful number, since it uses less digits than its factorization.

6688775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267561 (or 267556 counting only the distinct ones).

The product of its digits is 564480, while the sum is 47.

The square root of 6688775 is about 2586.2666142531. The cubic root of 6688775 is about 188.4150236020.

Subtracting from 6688775 its reverse (5778866), we obtain a palindrome (909909).

The spelling of 6688775 in words is "six million, six hundred eighty-eight thousand, seven hundred seventy-five".