6445745 has 4 divisors (see below), whose sum is σ = 7734900. Its totient is φ = 5156592.

The previous prime is 6445741. The next prime is 6445753. The reversal of 6445745 is 5475446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5475446 = 2 ⋅2737723.

It can be written as a sum of positive squares in 2 ways, for example, as 1100401 + 5345344 = 1049^2 + 2312^2 .

It is a cyclic number.

It is not a de Polignac number, because 6445745 - 2² = 6445741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6445741) by changing a digit.

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, 644570 + ... + 644579.

It is an arithmetic number, because the mean of its divisors is an integer number (1933725).

Almost surely, 2^6445745 is an apocalyptic number.

It is an amenable number.

6445745 is a deficient number, since it is larger than the sum of its proper divisors (1289155).

6445745 is a wasteful number, since it uses less digits than its factorization.

6445745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289154.

The product of its digits is 67200, while the sum is 35.

The square root of 6445745 is about 2538.8471793316. The cubic root of 6445745 is about 186.1048566663.

Subtracting from 6445745 its reverse (5475446), we obtain a cube (970299 = 99³).

The spelling of 6445745 in words is "six million, four hundred forty-five thousand, seven hundred forty-five".