6688755 has 12 divisors (see below), whose sum is σ = 11593920. Its totient is φ = 3567312.

The previous prime is 6688727. The next prime is 6688757. The reversal of 6688755 is 5578866.

It is not a de Polignac number, because 6688755 - 2⁵ = 6688723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 148639 = 6688755 / (6 + 6 + 8 + 8 + 7 + 5 + 5).

6688755 is a lucky number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 6688755.

It is not an unprimeable number, because it can be changed into a prime (6688757) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74275 + ... + 74364.

It is an arithmetic number, because the mean of its divisors is an integer number (966160).

Almost surely, 2^6688755 is an apocalyptic number.

6688755 is a deficient number, since it is larger than the sum of its proper divisors (4905165).

6688755 is a wasteful number, since it uses less digits than its factorization.

6688755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148650 (or 148647 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 6688755 is about 2586.2627476728. The cubic root of 6688755 is about 188.4148358095.

The spelling of 6688755 in words is "six million, six hundred eighty-eight thousand, seven hundred fifty-five".