689978608 has 40 divisors (see below), whose sum is σ = 1459906560. Its totient is φ = 313295040.

The previous prime is 689978599. The next prime is 689978629. The reversal of 689978608 is 806879986.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255441 + ... + 258127.

It is an arithmetic number, because the mean of its divisors is an integer number (36497664).

Almost surely, 2^689978608 is an apocalyptic number.

It is an amenable number.

689978608 is an abundant number, since it is smaller than the sum of its proper divisors (769927952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689978608 is a wasteful number, since it uses less digits than its factorization.

689978608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165 (or 4159 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 61.

The square root of 689978608 is about 26267.4438802103. The cubic root of 689978608 is about 883.6464601844.

The spelling of 689978608 in words is "six hundred eighty-nine million, nine hundred seventy-eight thousand, six hundred eight".