65321718 has 64 divisors (see below), whose sum is σ = 172482048. Its totient is φ = 15966720.

The previous prime is 65321693. The next prime is 65321719. The reversal of 65321718 is 81712356.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65321719) 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 31 ways as a sum of consecutive naturals, for example, 3696 + ... + 12012.

It is an arithmetic number, because the mean of its divisors is an integer number (2695032).

Almost surely, 2^65321718 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65321718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86241024).

65321718 is an abundant number, since it is smaller than the sum of its proper divisors (107160330).

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

65321718 is a wasteful number, since it uses less digits than its factorization.

65321718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8357.

The product of its digits is 10080, while the sum is 33.

The square root of 65321718 is about 8082.1852243066. The cubic root of 65321718 is about 402.7348382025.

The spelling of 65321718 in words is "sixty-five million, three hundred twenty-one thousand, seven hundred eighteen".