689023221012 has 144 divisors (see below), whose sum is σ = 2082281281920. Its totient is φ = 196458804864.

The previous prime is 689023221001. The next prime is 689023221113. The reversal of 689023221012 is 210122320986.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2443528 + ... + 2710880.

It is an arithmetic number, because the mean of its divisors is an integer number (14460286680).

Almost surely, 2^689023221012 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 689023221012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041140640960).

689023221012 is an abundant number, since it is smaller than the sum of its proper divisors (1393258060908).

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

689023221012 is a wasteful number, since it uses less digits than its factorization.

689023221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267867 (or 267852 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

Adding to 689023221012 its reverse (210122320986), we get a palindrome (899145541998).

The spelling of 689023221012 in words is "six hundred eighty-nine billion, twenty-three million, two hundred twenty-one thousand, twelve".