689785064089 has 9 divisors (see below), whose sum is σ = 758203542229. Its totient is φ = 627069025660.

The previous prime is 689785064081. The next prime is 689785064123. The reversal of 689785064089 is 980460587986.

The square root of 689785064089 is 830533.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 689785064089 - 2³ = 689785064081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689785064081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9098112 + ... + 9173614.

Almost surely, 2^689785064089 is an apocalyptic number.

689785064089 is the 830533-rd square number.

689785064089 is the 415267-th centered octagonal number.

It is an amenable number.

689785064089 is a deficient number, since it is larger than the sum of its proper divisors (68418478140).

689785064089 is an frugal number, since it uses more digits than its factorization.

689785064089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151028 (or 75514 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 70.

The spelling of 689785064089 in words is "six hundred eighty-nine billion, seven hundred eighty-five million, sixty-four thousand, eighty-nine".