6688477 has 4 divisors (see below), whose sum is σ = 6737436. Its totient is φ = 6639520.

The previous prime is 6688471. The next prime is 6688481. The reversal of 6688477 is 7748866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7748866 = 2 ⋅3874433.

It can be written as a sum of positive squares in 2 ways, for example, as 4553956 + 2134521 = 2134^2 + 1461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6688477 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6688471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24274 + ... + 24547.

It is an arithmetic number, because the mean of its divisors is an integer number (1684359).

Almost surely, 2^6688477 is an apocalyptic number.

It is an amenable number.

6688477 is a deficient number, since it is larger than the sum of its proper divisors (48959).

6688477 is a wasteful number, since it uses less digits than its factorization.

6688477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48958.

The product of its digits is 451584, while the sum is 46.

The square root of 6688477 is about 2586.2090016083. The cubic root of 6688477 is about 188.4122254558.

The spelling of 6688477 in words is "six million, six hundred eighty-eight thousand, four hundred seventy-seven".