65816789 has 4 divisors (see below), whose sum is σ = 67347456. Its totient is φ = 64286124.

The previous prime is 65816783. The next prime is 65816827. The reversal of 65816789 is 98761856.

It is a happy number.

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 65816789 - 2⁸ = 65816533 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65816783) 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, 765269 + ... + 765354.

It is an arithmetic number, because the mean of its divisors is an integer number (16836864).

Almost surely, 2^65816789 is an apocalyptic number.

It is an amenable number.

65816789 is a deficient number, since it is larger than the sum of its proper divisors (1530667).

65816789 is a wasteful number, since it uses less digits than its factorization.

65816789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530666.

The product of its digits is 725760, while the sum is 50.

The square root of 65816789 is about 8112.7547109474. The cubic root of 65816789 is about 403.7497163139.

The spelling of 65816789 in words is "sixty-five million, eight hundred sixteen thousand, seven hundred eighty-nine".