689789693 has 4 divisors (see below), whose sum is σ = 689900028. Its totient is φ = 689679360.

The previous prime is 689789669. The next prime is 689789741. The reversal of 689789693 is 396987986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 396987986 = 2 ⋅198493993.

It can be written as a sum of positive squares in 2 ways, for example, as 79798489 + 609991204 = 8933^2 + 24698^2 .

It is a cyclic number.

It is not a de Polignac number, because 689789693 - 2²⁰ = 688741117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689789293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45188 + ... + 58493.

It is an arithmetic number, because the mean of its divisors is an integer number (172475007).

Almost surely, 2^689789693 is an apocalyptic number.

It is an amenable number.

689789693 is a deficient number, since it is larger than the sum of its proper divisors (110335).

689789693 is a wasteful number, since it uses less digits than its factorization.

689789693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110334.

The product of its digits is 35271936, while the sum is 65.

The square root of 689789693 is about 26263.8476427198. The cubic root of 689789693 is about 883.5658058439.

The spelling of 689789693 in words is "six hundred eighty-nine million, seven hundred eighty-nine thousand, six hundred ninety-three".