689869781056 has 49 divisors (see below), whose sum is σ = 1398720354319. Its totient is φ = 337595850304.

The previous prime is 689869781023. The next prime is 689869781071. The reversal of 689869781056 is 650187968986.

The square root of 689869781056 is 830584.

The cubic root of 689869781056 is 8836.

It is a perfect power (a square, a cube, a 6-th power), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 689869781056.

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 6 ways as a sum of consecutive naturals, for example, 14678080425 + ... + 14678080471.

Almost surely, 2^689869781056 is an apocalyptic number.

689869781056 is the 830584-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689869781056

689869781056 is an abundant number, since it is smaller than the sum of its proper divisors (708850573263).

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

689869781056 is an frugal number, since it uses more digits than its factorization.

689869781056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 313528320, while the sum is 73.

The spelling of 689869781056 in words is "six hundred eighty-nine billion, eight hundred sixty-nine million, seven hundred eighty-one thousand, fifty-six".