6721828 has 6 divisors (see below), whose sum is σ = 11763206. Its totient is φ = 3360912.

The previous prime is 6721789. The next prime is 6721843. The reversal of 6721828 is 8281276.

It can be written as a sum of positive squares in only one way, i.e., 6718464 + 3364 = 2592^2 + 58^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6721793 and 6721802.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840225 + ... + 840232.

Almost surely, 2^6721828 is an apocalyptic number.

It is an amenable number.

6721828 is a deficient number, since it is larger than the sum of its proper divisors (5041378).

6721828 is a wasteful number, since it uses less digits than its factorization.

6721828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680461 (or 1680459 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 6721828 is about 2592.6488385433. The cubic root of 6721828 is about 188.7248686625.

It can be divided in two parts, 672 and 1828, that added together give a square (2500 = 50²).

The spelling of 6721828 in words is "six million, seven hundred twenty-one thousand, eight hundred twenty-eight".