689906859 has 4 divisors (see below), whose sum is σ = 919875816. Its totient is φ = 459937904.

The previous prime is 689906857. The next prime is 689906881. The reversal of 689906859 is 958609986.

689906859 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 689906859 - 2¹ = 689906857 is a prime.

It is a super-3 number, since 3×689906859³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (689906857) 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, 114984474 + ... + 114984479.

It is an arithmetic number, because the mean of its divisors is an integer number (229968954).

Almost surely, 2^689906859 is an apocalyptic number.

689906859 is a deficient number, since it is larger than the sum of its proper divisors (229968957).

689906859 is a wasteful number, since it uses less digits than its factorization.

689906859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229968956.

The product of its (nonzero) digits is 8398080, while the sum is 60.

The square root of 689906859 is about 26266.0781046581. The cubic root of 689906859 is about 883.6158297915.

The spelling of 689906859 in words is "six hundred eighty-nine million, nine hundred six thousand, eight hundred fifty-nine".