65720233 has 4 divisors (see below), whose sum is σ = 66701200. Its totient is φ = 64739268.

The previous prime is 65720191. The next prime is 65720257. The reversal of 65720233 is 33202756.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65720233 - 2²¹ = 63623081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65720273) 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 3 ways as a sum of consecutive naturals, for example, 490383 + ... + 490516.

It is an arithmetic number, because the mean of its divisors is an integer number (16675300).

Almost surely, 2^65720233 is an apocalyptic number.

It is an amenable number.

65720233 is a deficient number, since it is larger than the sum of its proper divisors (980967).

65720233 is an equidigital number, since it uses as much as digits as its factorization.

65720233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980966.

The product of its (nonzero) digits is 7560, while the sum is 28.

The square root of 65720233 is about 8106.8016504661. The cubic root of 65720233 is about 403.5521804080.

Adding to 65720233 its reverse (33202756), we get a palindrome (98922989).

The spelling of 65720233 in words is "sixty-five million, seven hundred twenty thousand, two hundred thirty-three".