689388721350 has 192 divisors, whose sum is σ = 2017832374272. Its totient is φ = 152425152000.

The previous prime is 689388721339. The next prime is 689388721379. The reversal of 689388721350 is 53127883986.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 141817920 + ... + 141822780.

It is an arithmetic number, because the mean of its divisors is an integer number (10509543616).

Almost surely, 2^689388721350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689388721350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1008916187136).

689388721350 is an abundant number, since it is smaller than the sum of its proper divisors (1328443652922).

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

689388721350 is a wasteful number, since it uses less digits than its factorization.

689388721350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9271 (or 9266 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 60.

The spelling of 689388721350 in words is "six hundred eighty-nine billion, three hundred eighty-eight million, seven hundred twenty-one thousand, three hundred fifty".