6445378 has 4 divisors (see below), whose sum is σ = 9668070. Its totient is φ = 3222688.

The previous prime is 6445319. The next prime is 6445381. The reversal of 6445378 is 8735446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4052169 + 2393209 = 2013^2 + 1547^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1611343 + ... + 1611346.

Almost surely, 2^6445378 is an apocalyptic number.

6445378 is a deficient number, since it is larger than the sum of its proper divisors (3222692).

6445378 is a wasteful number, since it uses less digits than its factorization.

6445378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3222691.

The product of its digits is 80640, while the sum is 37.

The square root of 6445378 is about 2538.7749014042. The cubic root of 6445378 is about 186.1013245285.

The spelling of 6445378 in words is "six million, four hundred forty-five thousand, three hundred seventy-eight".