686080989 has 32 divisors (see below), whose sum is σ = 1119043200. Its totient is φ = 411972480.

The previous prime is 686080979. The next prime is 686081009. The reversal of 686080989 is 989080686.

It is not a de Polignac number, because 686080989 - 2¹² = 686076893 is a prime.

686080989 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686080909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21777 + ... + 42969.

It is an arithmetic number, because the mean of its divisors is an integer number (34970100).

Almost surely, 2^686080989 is an apocalyptic number.

It is an amenable number.

686080989 is a deficient number, since it is larger than the sum of its proper divisors (432962211).

686080989 is a wasteful number, since it uses less digits than its factorization.

686080989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21322 (or 21316 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The square root of 686080989 is about 26193.1477489820. The cubic root of 686080989 is about 881.9794409572.

The spelling of 686080989 in words is "six hundred eighty-six million, eighty thousand, nine hundred eighty-nine".