689779813 has 8 divisors (see below), whose sum is σ = 706287296. Its totient is φ = 673293600.

The previous prime is 689779787. The next prime is 689779817. The reversal of 689779813 is 318977986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 689779813 - 2²¹ = 687682661 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 (689779817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74353 + ... + 83113.

It is an arithmetic number, because the mean of its divisors is an integer number (88285912).

Almost surely, 2^689779813 is an apocalyptic number.

It is an amenable number.

689779813 is a deficient number, since it is larger than the sum of its proper divisors (16507483).

689779813 is a wasteful number, since it uses less digits than its factorization.

689779813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10635.

The product of its digits is 4572288, while the sum is 58.

The square root of 689779813 is about 26263.6595507938. The cubic root of 689779813 is about 883.5615873254.

The spelling of 689779813 in words is "six hundred eighty-nine million, seven hundred seventy-nine thousand, eight hundred thirteen".