680239394 has 8 divisors (see below), whose sum is σ = 1080380268. Its totient is φ = 320112640.

The previous prime is 680239363. The next prime is 680239397. The reversal of 680239394 is 493932086.

It can be written as a sum of positive squares in 2 ways, for example, as 665898025 + 14341369 = 25805^2 + 3787^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (680239397) 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, 10003487 + ... + 10003554.

Almost surely, 2^680239394 is an apocalyptic number.

680239394 is a deficient number, since it is larger than the sum of its proper divisors (400140874).

680239394 is a wasteful number, since it uses less digits than its factorization.

680239394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20007060.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 680239394 is about 26081.3993873028. The cubic root of 680239394 is about 879.4691159166.

The spelling of 680239394 in words is "six hundred eighty million, two hundred thirty-nine thousand, three hundred ninety-four".