689044390560 has 144 divisors (see below), whose sum is σ = 2475120080160. Its totient is φ = 174074365440.

The previous prime is 689044390511. The next prime is 689044390577. The reversal of 689044390560 is 65093440986.

689044390560 is a `hidden beast` number, since 6 + 8 + 9 + 0 + 44 + 39 + 0 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×689044390560² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 689044390497 and 689044390506.

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, 12564826 + ... + 12619545.

It is an arithmetic number, because the mean of its divisors is an integer number (17188333890).

Almost surely, 2^689044390560 is an apocalyptic number.

689044390560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

689044390560 is an abundant number, since it is smaller than the sum of its proper divisors (1786075689600).

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

689044390560 is a wasteful number, since it uses less digits than its factorization.

689044390560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25184411 (or 25184400 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 689044390560 in words is "six hundred eighty-nine billion, forty-four million, three hundred ninety thousand, five hundred sixty".