673390805 has 4 divisors (see below), whose sum is σ = 808068972. Its totient is φ = 538712640.

The previous prime is 673390801. The next prime is 673390807. The reversal of 673390805 is 508093376.

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 387577969 + 285812836 = 19687^2 + 16906^2 .

It is not a de Polignac number, because 673390805 - 2² = 673390801 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 (673390801) 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, 67339076 + ... + 67339085.

It is an arithmetic number, because the mean of its divisors is an integer number (202017243).

Almost surely, 2^673390805 is an apocalyptic number.

It is an amenable number.

673390805 is a deficient number, since it is larger than the sum of its proper divisors (134678167).

673390805 is a wasteful number, since it uses less digits than its factorization.

673390805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134678166.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 673390805 is about 25949.7746618347. The cubic root of 673390805 is about 876.5076831187.

The spelling of 673390805 in words is "six hundred seventy-three million, three hundred ninety thousand, eight hundred five".