6690779 has 4 divisors (see below), whose sum is σ = 6833184. Its totient is φ = 6548376.

The previous prime is 6690767. The next prime is 6690787. The reversal of 6690779 is 9770966.

6690779 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9770966 = 2 ⋅4885483.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6690779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6690179) 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, 71132 + ... + 71225.

It is an arithmetic number, because the mean of its divisors is an integer number (1708296).

Almost surely, 2^6690779 is an apocalyptic number.

6690779 is a deficient number, since it is larger than the sum of its proper divisors (142405).

6690779 is a wasteful number, since it uses less digits than its factorization.

6690779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142404.

The product of its (nonzero) digits is 142884, while the sum is 44.

The square root of 6690779 is about 2586.6540162921. The cubic root of 6690779 is about 188.4338385073.

The spelling of 6690779 in words is "six million, six hundred ninety thousand, seven hundred seventy-nine".