673656605 has 4 divisors (see below), whose sum is σ = 808387932. Its totient is φ = 538925280.

The previous prime is 673656601. The next prime is 673656649. The reversal of 673656605 is 506656376.

673656605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 513203716 + 160452889 = 22654^2 + 12667^2 .

It is not a de Polignac number, because 673656605 - 2² = 673656601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673656601) 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, 67365656 + ... + 67365665.

It is an arithmetic number, because the mean of its divisors is an integer number (202096983).

Almost surely, 2^673656605 is an apocalyptic number.

It is an amenable number.

673656605 is a deficient number, since it is larger than the sum of its proper divisors (134731327).

673656605 is a wasteful number, since it uses less digits than its factorization.

673656605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134731326.

The product of its (nonzero) digits is 680400, while the sum is 44.

The square root of 673656605 is about 25954.8955883086. The cubic root of 673656605 is about 876.6229926309.

The spelling of 673656605 in words is "six hundred seventy-three million, six hundred fifty-six thousand, six hundred five".