6664779 has 24 divisors (see below), whose sum is σ = 10962432. Its totient is φ = 3862320.

The previous prime is 6664771. The next prime is 6664787. The reversal of 6664779 is 9774666.

It is an interprime number because it is at equal distance from previous prime (6664771) and next prime (6664787).

It is not a de Polignac number, because 6664779 - 2³ = 6664771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6664771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 814 + ... + 3740.

It is an arithmetic number, because the mean of its divisors is an integer number (456768).

Almost surely, 2^6664779 is an apocalyptic number.

6664779 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

6664779 is a deficient number, since it is larger than the sum of its proper divisors (4297653).

6664779 is a wasteful number, since it uses less digits than its factorization.

6664779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967 (or 2964 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 6664779 is about 2581.6233265138. The cubic root of 6664779 is about 188.1894404759.

It can be divided in two parts, 666 and 4779, that added together give a palindrome (5445).

The spelling of 6664779 in words is "six million, six hundred sixty-four thousand, seven hundred seventy-nine".