6816445 has 8 divisors (see below), whose sum is σ = 8314200. Its totient is φ = 5363520.

The previous prime is 6816431. The next prime is 6816449. The reversal of 6816445 is 5446186.

It can be written as a sum of positive squares in 4 ways, for example, as 190969 + 6625476 = 437^2 + 2574^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6816445 - 2⁵ = 6816413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6816445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6816449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10870 + ... + 11479.

It is an arithmetic number, because the mean of its divisors is an integer number (1039275).

Almost surely, 2^6816445 is an apocalyptic number.

It is an amenable number.

6816445 is a deficient number, since it is larger than the sum of its proper divisors (1497755).

6816445 is a wasteful number, since it uses less digits than its factorization.

6816445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22415.

The product of its digits is 23040, while the sum is 34.

The square root of 6816445 is about 2610.8322427916. The cubic root of 6816445 is about 189.6062482734.

It can be divided in two parts, 68 and 16445, that multiplied together give a triangular number (1118260 = T₁₄₉₅).

The spelling of 6816445 in words is "six million, eight hundred sixteen thousand, four hundred forty-five".