89919965 has 4 divisors (see below), whose sum is σ = 107903964. Its totient is φ = 71935968.

The previous prime is 89919943. The next prime is 89919967. The reversal of 89919965 is 56991998.

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 62900761 + 27019204 = 7931^2 + 5198^2 .

It is a cyclic number.

It is not a de Polignac number, because 89919965 - 2¹⁴ = 89903581 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 89919965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89919967) 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, 8991992 + ... + 8992001.

It is an arithmetic number, because the mean of its divisors is an integer number (26975991).

Almost surely, 2^89919965 is an apocalyptic number.

It is an amenable number.

89919965 is a deficient number, since it is larger than the sum of its proper divisors (17983999).

89919965 is a wasteful number, since it uses less digits than its factorization.

89919965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17983998.

The product of its digits is 1574640, while the sum is 56.

The square root of 89919965 is about 9482.6138274212. The cubic root of 89919965 is about 448.0075948038.

The spelling of 89919965 in words is "eighty-nine million, nine hundred nineteen thousand, nine hundred sixty-five".