689617660 has 48 divisors (see below), whose sum is σ = 1485259776. Its totient is φ = 268817472.

The previous prime is 689617613. The next prime is 689617681. The reversal of 689617660 is 66716986.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624669 + ... + 625771.

It is an arithmetic number, because the mean of its divisors is an integer number (30942912).

Almost surely, 2^689617660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689617660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (742629888).

689617660 is an abundant number, since it is smaller than the sum of its proper divisors (795642116).

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

689617660 is a wasteful number, since it uses less digits than its factorization.

689617660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1882 (or 1880 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 689617660 is about 26260.5723471519. The cubic root of 689617660 is about 883.4923462006.

The spelling of 689617660 in words is "six hundred eighty-nine million, six hundred seventeen thousand, six hundred sixty".