65788321 has 3 divisors (see below), whose sum is σ = 65796433. Its totient is φ = 65780210.

The previous prime is 65788319. The next prime is 65788339. The reversal of 65788321 is 12388756.

The square root of 65788321 is 8111.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 65788321 - 2¹ = 65788319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65788301) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4056 + ... + 12166.

Almost surely, 2^65788321 is an apocalyptic number.

65788321 is the 8111-st square number.

65788321 is the 4056-th centered octagonal number.

It is an amenable number.

65788321 is a deficient number, since it is larger than the sum of its proper divisors (8112).

65788321 is an frugal number, since it uses more digits than its factorization.

65788321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16222 (or 8111 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The cubic root of 65788321 is about 403.6914960904.

The spelling of 65788321 in words is "sixty-five million, seven hundred eighty-eight thousand, three hundred twenty-one".