688770193 has 8 divisors (see below), whose sum is σ = 705920040. Its totient is φ = 671637120.

The previous prime is 688770191. The next prime is 688770209. The reversal of 688770193 is 391077886.

It can be written as a sum of positive squares in 4 ways, for example, as 225961024 + 462809169 = 15032^2 + 21513^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 688770193 - 2¹ = 688770191 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688770191) 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 7 ways as a sum of consecutive naturals, for example, 136471 + ... + 141427.

It is an arithmetic number, because the mean of its divisors is an integer number (88240005).

Almost surely, 2^688770193 is an apocalyptic number.

It is an amenable number.

688770193 is a deficient number, since it is larger than the sum of its proper divisors (17149847).

688770193 is a wasteful number, since it uses less digits than its factorization.

688770193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8387.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 688770193 is about 26244.4316570201. The cubic root of 688770193 is about 883.1302917054.

The spelling of 688770193 in words is "six hundred eighty-eight million, seven hundred seventy thousand, one hundred ninety-three".