65723989 has 4 divisors (see below), whose sum is σ = 69590124. Its totient is φ = 61857856.

The previous prime is 65723981. The next prime is 65724013. The reversal of 65723989 is 98932756.

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 61355889 + 4368100 = 7833^2 + 2090^2 .

It is a cyclic number.

It is not a de Polignac number, because 65723989 - 2³ = 65723981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65723981) 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, 1933042 + ... + 1933075.

It is an arithmetic number, because the mean of its divisors is an integer number (17397531).

Almost surely, 2^65723989 is an apocalyptic number.

It is an amenable number.

65723989 is a deficient number, since it is larger than the sum of its proper divisors (3866135).

65723989 is a wasteful number, since it uses less digits than its factorization.

65723989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3866134.

The product of its digits is 816480, while the sum is 49.

The square root of 65723989 is about 8107.0333044832. The cubic root of 65723989 is about 403.5598681121.

The spelling of 65723989 in words is "sixty-five million, seven hundred twenty-three thousand, nine hundred eighty-nine".