688767349 has 2 divisors, whose sum is σ = 688767350. Its totient is φ = 688767348.

The previous prime is 688767311. The next prime is 688767353. The reversal of 688767349 is 943767886.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 642622500 + 46144849 = 25350^2 + 6793^2 .

It is a cyclic number.

It is not a de Polignac number, because 688767349 - 2²⁵ = 655212917 is a prime.

It is a super-2 number, since 2×688767349² = 948800922096975602, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 688767293 and 688767302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688767649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344383674 + 344383675.

It is an arithmetic number, because the mean of its divisors is an integer number (344383675).

Almost surely, 2^688767349 is an apocalyptic number.

It is an amenable number.

688767349 is a deficient number, since it is larger than the sum of its proper divisors (1).

688767349 is an equidigital number, since it uses as much as digits as its factorization.

688767349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 58.

The square root of 688767349 is about 26244.3774740419. The cubic root of 688767349 is about 883.1290761931.

The spelling of 688767349 in words is "six hundred eighty-eight million, seven hundred sixty-seven thousand, three hundred forty-nine".