680726194 has 8 divisors (see below), whose sum is σ = 1022440428. Its totient is φ = 339912720.

The previous prime is 680726191. The next prime is 680726197. The reversal of 680726194 is 491627086.

It is an interprime number because it is at equal distance from previous prime (680726191) and next prime (680726197).

It can be written as a sum of positive squares in 2 ways, for example, as 611919169 + 68807025 = 24737^2 + 8295^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 680726194.

It is not an unprimeable number, because it can be changed into a prime (680726191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223297 + ... + 226324.

Almost surely, 2^680726194 is an apocalyptic number.

680726194 is a deficient number, since it is larger than the sum of its proper divisors (341714234).

680726194 is a wasteful number, since it uses less digits than its factorization.

680726194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450380.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 680726194 is about 26090.7300396137. The cubic root of 680726194 is about 879.6788575083.

The spelling of 680726194 in words is "six hundred eighty million, seven hundred twenty-six thousand, one hundred ninety-four".