675445 has 4 divisors (see below), whose sum is σ = 810540. Its totient is φ = 540352.

The previous prime is 675419. The next prime is 675449. The reversal of 675445 is 544576.

It is a happy number.

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 509796 + 165649 = 714^2 + 407^2 .

It is a cyclic number.

It is not a de Polignac number, because 675445 - 2⁵ = 675413 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

675445 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (675449) 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, 67540 + ... + 67549.

It is an arithmetic number, because the mean of its divisors is an integer number (202635).

2⁶⁷⁵⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

675445 is a deficient number, since it is larger than the sum of its proper divisors (135095).

675445 is a wasteful number, since it uses less digits than its factorization.

675445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135094.

The product of its digits is 16800, while the sum is 31.

The square root of 675445 is about 821.8546100132. The cubic root of 675445 is about 87.7398047695.

The spelling of 675445 in words is "six hundred seventy-five thousand, four hundred forty-five".