689746879 has 2 divisors, whose sum is σ = 689746880. Its totient is φ = 689746878.

The previous prime is 689746861. The next prime is 689746891. The reversal of 689746879 is 978647986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689746879 - 2⁹ = 689746367 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689746879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689746819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344873439 + 344873440.

It is an arithmetic number, because the mean of its divisors is an integer number (344873440).

Almost surely, 2^689746879 is an apocalyptic number.

689746879 is a deficient number, since it is larger than the sum of its proper divisors (1).

689746879 is an equidigital number, since it uses as much as digits as its factorization.

689746879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36578304, while the sum is 64.

The square root of 689746879 is about 26263.0325552858. The cubic root of 689746879 is about 883.5475250213.

The spelling of 689746879 in words is "six hundred eighty-nine million, seven hundred forty-six thousand, eight hundred seventy-nine".