689145390 has 72 divisors (see below), whose sum is σ = 1891134648. Its totient is φ = 174091680.

The previous prime is 689145271. The next prime is 689145403. The reversal of 689145390 is 93541986.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21885 + ... + 43095.

It is an arithmetic number, because the mean of its divisors is an integer number (26265759).

Almost surely, 2^689145390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689145390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (945567324).

689145390 is an abundant number, since it is smaller than the sum of its proper divisors (1201989258).

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

689145390 is a wasteful number, since it uses less digits than its factorization.

689145390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21262 (or 21240 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 689145390 is about 26251.5788096640. The cubic root of 689145390 is about 883.2906198246.

The spelling of 689145390 in words is "six hundred eighty-nine million, one hundred forty-five thousand, three hundred ninety".