6642836 has 6 divisors (see below), whose sum is σ = 11624970. Its totient is φ = 3321416.

The previous prime is 6642829. The next prime is 6642847. The reversal of 6642836 is 6382466.

It can be written as a sum of positive squares in only one way, i.e., 4177936 + 2464900 = 2044^2 + 1570^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6642796 and 6642805.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 830351 + ... + 830358.

It is an arithmetic number, because the mean of its divisors is an integer number (1937495).

Almost surely, 2^6642836 is an apocalyptic number.

It is an amenable number.

6642836 is a deficient number, since it is larger than the sum of its proper divisors (4982134).

6642836 is a wasteful number, since it uses less digits than its factorization.

6642836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660713 (or 1660711 counting only the distinct ones).

The product of its digits is 41472, while the sum is 35.

The square root of 6642836 is about 2577.3699773218. The cubic root of 6642836 is about 187.9826828775.

The spelling of 6642836 in words is "six million, six hundred forty-two thousand, eight hundred thirty-six".