65172320 has 48 divisors (see below), whose sum is σ = 156165408. Its totient is φ = 25697280.

The previous prime is 65172293. The next prime is 65172361. The reversal of 65172320 is 2327156.

65172320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 65172320.

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 7 ways as a sum of consecutive naturals, for example, 8492 + ... + 14228.

It is an arithmetic number, because the mean of its divisors is an integer number (3253446).

Almost surely, 2^65172320 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 65172320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78082704).

65172320 is an abundant number, since it is smaller than the sum of its proper divisors (90993088).

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

65172320 is a wasteful number, since it uses less digits than its factorization.

65172320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5823 (or 5815 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 65172320 is about 8072.9375075000. The cubic root of 65172320 is about 402.4275707796.

Adding to 65172320 its reverse (2327156), we get a palindrome (67499476).

The spelling of 65172320 in words is "sixty-five million, one hundred seventy-two thousand, three hundred twenty".