6688977 has 4 divisors (see below), whose sum is σ = 8918640. Its totient is φ = 4459316.

The previous prime is 6688967. The next prime is 6688999. The reversal of 6688977 is 7798866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6688977 - 2⁷ = 6688849 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6688907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1114827 + ... + 1114832.

It is an arithmetic number, because the mean of its divisors is an integer number (2229660).

Almost surely, 2^6688977 is an apocalyptic number.

It is an amenable number.

6688977 is a deficient number, since it is larger than the sum of its proper divisors (2229663).

6688977 is a wasteful number, since it uses less digits than its factorization.

6688977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2229662.

The product of its digits is 1016064, while the sum is 51.

The square root of 6688977 is about 2586.3056663898. The cubic root of 6688977 is about 188.4169202847.

It can be divided in two parts, 66889 and 77, that added together give a palindrome (66966).

The spelling of 6688977 in words is "six million, six hundred eighty-eight thousand, nine hundred seventy-seven".