673765 has 4 divisors (see below), whose sum is σ = 808524. Its totient is φ = 539008.

The previous prime is 673747. The next prime is 673769. The reversal of 673765 is 567376.

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 527076 + 146689 = 726^2 + 383^2 .

It is a cyclic number.

It is not a de Polignac number, because 673765 - 2⁷ = 673637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 673765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673769) 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, 67372 + ... + 67381.

It is an arithmetic number, because the mean of its divisors is an integer number (202131).

2⁶⁷³⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

673765 is a deficient number, since it is larger than the sum of its proper divisors (134759).

673765 is a wasteful number, since it uses less digits than its factorization.

673765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134758.

The product of its digits is 26460, while the sum is 34.

The square root of 673765 is about 820.8318950918. The cubic root of 673765 is about 87.6670007907.

The spelling of 673765 in words is "six hundred seventy-three thousand, seven hundred sixty-five".