6642579 has 4 divisors (see below), whose sum is σ = 8856776. Its totient is φ = 4428384.

The previous prime is 6642553. The next prime is 6642593. The reversal of 6642579 is 9752466.

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

It is not a de Polignac number, because 6642579 - 2⁹ = 6642067 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

6642579 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642539) 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, 1107094 + ... + 1107099.

It is an arithmetic number, because the mean of its divisors is an integer number (2214194).

Almost surely, 2^6642579 is an apocalyptic number.

6642579 is a deficient number, since it is larger than the sum of its proper divisors (2214197).

6642579 is a wasteful number, since it uses less digits than its factorization.

6642579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214196.

The product of its digits is 90720, while the sum is 39.

The square root of 6642579 is about 2577.3201198144. The cubic root of 6642579 is about 187.9802586031.

The spelling of 6642579 in words is "six million, six hundred forty-two thousand, five hundred seventy-nine".