6620779 has 4 divisors (see below), whose sum is σ = 7222680. Its totient is φ = 6018880.

The previous prime is 6620777. The next prime is 6620791. The reversal of 6620779 is 9770266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6620779 - 2¹ = 6620777 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6620771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300934 + ... + 300955.

It is an arithmetic number, because the mean of its divisors is an integer number (1805670).

Almost surely, 2^6620779 is an apocalyptic number.

6620779 is a deficient number, since it is larger than the sum of its proper divisors (601901).

6620779 is a wasteful number, since it uses less digits than its factorization.

6620779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601900.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 6620779 is about 2573.0874450745. The cubic root of 6620779 is about 187.7743917345.

The spelling of 6620779 in words is "six million, six hundred twenty thousand, seven hundred seventy-nine".