680764193 has 4 divisors (see below), whose sum is σ = 681385860. Its totient is φ = 680142528.

The previous prime is 680764181. The next prime is 680764199. The reversal of 680764193 is 391467086.

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 367757329 + 313006864 = 19177^2 + 17692^2 .

It is a cyclic number.

It is not a de Polignac number, because 680764193 - 2⁴ = 680764177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (680764199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309188 + ... + 311381.

It is an arithmetic number, because the mean of its divisors is an integer number (170346465).

Almost surely, 2^680764193 is an apocalyptic number.

It is an amenable number.

680764193 is a deficient number, since it is larger than the sum of its proper divisors (621667).

680764193 is a wasteful number, since it uses less digits than its factorization.

680764193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621666.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 680764193 is about 26091.4582382817. The cubic root of 680764193 is about 879.6952254671.

The spelling of 680764193 in words is "six hundred eighty million, seven hundred sixty-four thousand, one hundred ninety-three".