689900777 has 2 divisors, whose sum is σ = 689900778. Its totient is φ = 689900776.

The previous prime is 689900741. The next prime is 689900833. The reversal of 689900777 is 777009986.

It is a happy number.

689900777 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 can be written as a sum of positive squares in only one way, i.e., 683770201 + 6130576 = 26149^2 + 2476^2 .

It is a cyclic number.

It is not a de Polignac number, because 689900777 - 2¹² = 689896681 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (689900707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344950388 + 344950389.

It is an arithmetic number, because the mean of its divisors is an integer number (344950389).

Almost surely, 2^689900777 is an apocalyptic number.

It is an amenable number.

689900777 is a deficient number, since it is larger than the sum of its proper divisors (1).

689900777 is an equidigital number, since it uses as much as digits as its factorization.

689900777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The square root of 689900777 is about 26265.9623276970. The cubic root of 689900777 is about 883.6132332249.

The spelling of 689900777 in words is "six hundred eighty-nine million, nine hundred thousand, seven hundred seventy-seven".