689018985 has 24 divisors (see below), whose sum is σ = 1194910080. Its totient is φ = 367288992.

The previous prime is 689018977. The next prime is 689018999. The reversal of 689018985 is 589810986.

It is not a de Polignac number, because 689018985 - 2³ = 689018977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 173856 + ... + 177774.

It is an arithmetic number, because the mean of its divisors is an integer number (49787920).

Almost surely, 2^689018985 is an apocalyptic number.

It is an amenable number.

689018985 is a deficient number, since it is larger than the sum of its proper divisors (505891095).

689018985 is a wasteful number, since it uses less digits than its factorization.

689018985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7837 (or 7834 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The square root of 689018985 is about 26249.1711297709. The cubic root of 689018985 is about 883.2366112996.

The spelling of 689018985 in words is "six hundred eighty-nine million, eighteen thousand, nine hundred eighty-five".