675649 has 4 divisors (see below), whose sum is σ = 727636. Its totient is φ = 623664.

The previous prime is 675643. The next prime is 675713. The reversal of 675649 is 946576.

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 135424 + 540225 = 368^2 + 735^2 .

It is a cyclic number.

It is not a de Polignac number, because 675649 - 2⁵ = 675617 is a prime.

675649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (675643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25974 + ... + 25999.

It is an arithmetic number, because the mean of its divisors is an integer number (181909).

2⁶⁷⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

675649 is a deficient number, since it is larger than the sum of its proper divisors (51987).

675649 is a wasteful number, since it uses less digits than its factorization.

675649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51986.

The product of its digits is 45360, while the sum is 37.

The square root of 675649 is about 821.9787101866. The cubic root of 675649 is about 87.7486370299.

The spelling of 675649 in words is "six hundred seventy-five thousand, six hundred forty-nine".