6446645 has 4 divisors (see below), whose sum is σ = 7735980. Its totient is φ = 5157312.

The previous prime is 6446633. The next prime is 6446651. The reversal of 6446645 is 5466446.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1615441 + 4831204 = 1271^2 + 2198^2 .

It is a cyclic number.

It is not a de Polignac number, because 6446645 - 2¹⁴ = 6430261 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644660 + ... + 644669.

It is an arithmetic number, because the mean of its divisors is an integer number (1933995).

Almost surely, 2^6446645 is an apocalyptic number.

It is an amenable number.

6446645 is a deficient number, since it is larger than the sum of its proper divisors (1289335).

6446645 is a wasteful number, since it uses less digits than its factorization.

6446645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289334.

The product of its digits is 69120, while the sum is 35.

The square root of 6446645 is about 2539.0244189452. The cubic root of 6446645 is about 186.1135180171.

The spelling of 6446645 in words is "six million, four hundred forty-six thousand, six hundred forty-five".