65920321 has 4 divisors (see below), whose sum is σ = 67001044. Its totient is φ = 64839600.

The previous prime is 65920313. The next prime is 65920331. The reversal of 65920321 is 12302956.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5640625 + 60279696 = 2375^2 + 7764^2 .

It is a cyclic number.

It is not a de Polignac number, because 65920321 - 2³ = 65920313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65920321.

It is not an unprimeable number, because it can be changed into a prime (65920331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540270 + ... + 540391.

It is an arithmetic number, because the mean of its divisors is an integer number (16750261).

Almost surely, 2^65920321 is an apocalyptic number.

65920321 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

65920321 is a deficient number, since it is larger than the sum of its proper divisors (1080723).

65920321 is a wasteful number, since it uses less digits than its factorization.

65920321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080722.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 65920321 is about 8119.1330202184. The cubic root of 65920321 is about 403.9613093196.

The spelling of 65920321 in words is "sixty-five million, nine hundred twenty thousand, three hundred twenty-one".