689687869860 has 480 divisors, whose sum is σ = 2476174821120. Its totient is φ = 159149491200.

The previous prime is 689687869837. The next prime is 689687869861. The reversal of 689687869860 is 68968786986.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a self number, because there is not a number n which added to its sum of digits gives 689687869860.

It is not an unprimeable number, because it can be changed into a prime (689687869861) by changing a digit.

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 159 ways as a sum of consecutive naturals, for example, 36681982 + ... + 36700778.

It is an arithmetic number, because the mean of its divisors is an integer number (5158697544).

Almost surely, 2^689687869860 is an apocalyptic number.

689687869860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689687869860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238087410560).

689687869860 is an abundant number, since it is smaller than the sum of its proper divisors (1786486951260).

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

689687869860 is a wasteful number, since it uses less digits than its factorization.

689687869860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18929 (or 18918 counting only the distinct ones).

The product of its (nonzero) digits is 3009871872, while the sum is 81.

The spelling of 689687869860 in words is "six hundred eighty-nine billion, six hundred eighty-seven million, eight hundred sixty-nine thousand, eight hundred sixty".