689730079 has 2 divisors, whose sum is σ = 689730080. Its totient is φ = 689730078.

The previous prime is 689730073. The next prime is 689730101. The reversal of 689730079 is 970037986.

689730079 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689730079 - 2³ = 689730071 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689730071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344865039 + 344865040.

It is an arithmetic number, because the mean of its divisors is an integer number (344865040).

Almost surely, 2^689730079 is an apocalyptic number.

689730079 is a deficient number, since it is larger than the sum of its proper divisors (1).

689730079 is an equidigital number, since it uses as much as digits as its factorization.

689730079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 689730079 is about 26262.7127121324. The cubic root of 689730079 is about 883.5403515110.

The spelling of 689730079 in words is "six hundred eighty-nine million, seven hundred thirty thousand, seventy-nine".