65928889 has 4 divisors (see below), whose sum is σ = 71000356. Its totient is φ = 60857424.

The previous prime is 65928883. The next prime is 65928893. The reversal of 65928889 is 98882956.

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 12390400 + 53538489 = 3520^2 + 7317^2 .

It is a cyclic number.

It is not a de Polignac number, because 65928889 - 2³ = 65928881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65928881) 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, 2535714 + ... + 2535739.

It is an arithmetic number, because the mean of its divisors is an integer number (17750089).

Almost surely, 2^65928889 is an apocalyptic number.

It is an amenable number.

65928889 is a deficient number, since it is larger than the sum of its proper divisors (5071467).

65928889 is a wasteful number, since it uses less digits than its factorization.

65928889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5071466.

The product of its digits is 2488320, while the sum is 55.

The square root of 65928889 is about 8119.6606456181. The cubic root of 65928889 is about 403.9788101980.

The spelling of 65928889 in words is "sixty-five million, nine hundred twenty-eight thousand, eight hundred eighty-nine".