6440828 has 12 divisors (see below), whose sum is σ = 11761680. Its totient is φ = 3080352.

The previous prime is 6440821. The next prime is 6440831. The reversal of 6440828 is 8280446.

6440828 is a modest number, since divided by 828 gives 644 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 6440794 and 6440803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34913 + ... + 35096.

It is an arithmetic number, because the mean of its divisors is an integer number (980140).

Almost surely, 2^6440828 is an apocalyptic number.

It is an amenable number.

6440828 is a deficient number, since it is larger than the sum of its proper divisors (5320852).

6440828 is a wasteful number, since it uses less digits than its factorization.

6440828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70036 (or 70034 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 6440828 is about 2537.8786417006. The cubic root of 6440828 is about 186.0575225794.

The spelling of 6440828 in words is "six million, four hundred forty thousand, eight hundred twenty-eight".