689802879891690 has 48 divisors (see below), whose sum is σ = 1793491555654656. Its totient is φ = 183947017413600.

The previous prime is 689802879891649. The next prime is 689802879891709. The reversal of 689802879891690 is 96198978208986.

689802879891690 is a `hidden beast` number, since 6 + 8 + 9 + 80 + 287 + 98 + 9 + 169 + 0 = 666.

It is a super-2 number, since 2×689802879891690² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (90).

It is a self number, because there is not a number n which added to its sum of digits gives 689802879891690.

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, 32274555 + ... + 49206225.

It is an arithmetic number, because the mean of its divisors is an integer number (37364407409472).

Almost surely, 2^{689802879891690} is an apocalyptic number.

689802879891690 is an abundant number, since it is smaller than the sum of its proper divisors (1103688675762966).

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

689802879891690 is a wasteful number, since it uses less digits than its factorization.

689802879891690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17384355 (or 17384352 counting only the distinct ones).

The product of its (nonzero) digits is 13544423424, while the sum is 90.

The spelling of 689802879891690 in words is "six hundred eighty-nine trillion, eight hundred two billion, eight hundred seventy-nine million, eight hundred ninety-one thousand, six hundred ninety".