679304905 has 4 divisors (see below), whose sum is σ = 815165892. Its totient is φ = 543443920.

The previous prime is 679304863. The next prime is 679304909. The reversal of 679304905 is 509403976.

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 514926864 + 164378041 = 22692^2 + 12821^2 .

It is not a de Polignac number, because 679304905 - 2¹⁵ = 679272137 is a prime.

It is a super-2 number, since 2×679304905² = 922910307914118050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679304909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67930486 + ... + 67930495.

It is an arithmetic number, because the mean of its divisors is an integer number (203791473).

Almost surely, 2^679304905 is an apocalyptic number.

It is an amenable number.

679304905 is a deficient number, since it is larger than the sum of its proper divisors (135860987).

679304905 is a wasteful number, since it uses less digits than its factorization.

679304905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135860986.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 679304905 is about 26063.4783749215. The cubic root of 679304905 is about 879.0662034252.

The spelling of 679304905 in words is "six hundred seventy-nine million, three hundred four thousand, nine hundred five".