6728320040 has 32 divisors (see below), whose sum is σ = 16303238280. Its totient is φ = 2484302592.

The previous prime is 6728320009. The next prime is 6728320087. The reversal of 6728320040 is 400238276.

It can be written as a sum of positive squares in 4 ways, for example, as 5576803684 + 1151516356 = 74678^2 + 33934^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6728319979 and 6728320006.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6469019 + ... + 6470058.

Almost surely, 2^6728320040 is an apocalyptic number.

It is an amenable number.

6728320040 is an abundant number, since it is smaller than the sum of its proper divisors (9574918240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6728320040 is a wasteful number, since it uses less digits than its factorization.

6728320040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12939101 (or 12939097 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 6728320040 is about 82026.3374776663. The cubic root of 6728320040 is about 1887.8560686085.

The spelling of 6728320040 in words is "six billion, seven hundred twenty-eight million, three hundred twenty thousand, forty".