673776639 has 12 divisors (see below), whose sum is σ = 973493872. Its totient is φ = 449064000.

The previous prime is 673776629. The next prime is 673776667. The reversal of 673776639 is 936677376.

673776639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 673776639 - 2¹⁵ = 673743871 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 (673776629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36999 + ... + 52119.

Almost surely, 2^673776639 is an apocalyptic number.

673776639 is a deficient number, since it is larger than the sum of its proper divisors (299717233).

673776639 is a wasteful number, since it uses less digits than its factorization.

673776639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20078 (or 20075 counting only the distinct ones).

The product of its digits is 6001128, while the sum is 54.

The square root of 673776639 is about 25957.2078429095. The cubic root of 673776639 is about 876.6750559098.

The spelling of 673776639 in words is "six hundred seventy-three million, seven hundred seventy-six thousand, six hundred thirty-nine".