6448945 has 4 divisors (see below), whose sum is σ = 7738740. Its totient is φ = 5159152.

The previous prime is 6448927. The next prime is 6448973. The reversal of 6448945 is 5498446.

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 1354896 + 5094049 = 1164^2 + 2257^2 .

It is a cyclic number.

It is not a de Polignac number, because 6448945 - 2⁵ = 6448913 is a prime.

It is a super-2 number, since 2×6448945² = 83177783226050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6448898 and 6448907.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644890 + ... + 644899.

It is an arithmetic number, because the mean of its divisors is an integer number (1934685).

Almost surely, 2^6448945 is an apocalyptic number.

It is an amenable number.

6448945 is a deficient number, since it is larger than the sum of its proper divisors (1289795).

6448945 is a wasteful number, since it uses less digits than its factorization.

6448945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289794.

The product of its digits is 138240, while the sum is 40.

The square root of 6448945 is about 2539.4773084239. The cubic root of 6448945 is about 186.1356489185.

The spelling of 6448945 in words is "six million, four hundred forty-eight thousand, nine hundred forty-five".