65398889 has 4 divisors (see below), whose sum is σ = 65452500. Its totient is φ = 65345280.

The previous prime is 65398859. The next prime is 65398909. The reversal of 65398889 is 98889356.

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 13630864 + 51768025 = 3692^2 + 7195^2 .

It is a cyclic number.

It is not a de Polignac number, because 65398889 - 2¹⁶ = 65333353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65398819) 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, 24932 + ... + 27429.

It is an arithmetic number, because the mean of its divisors is an integer number (16363125).

Almost surely, 2^65398889 is an apocalyptic number.

It is an amenable number.

65398889 is a deficient number, since it is larger than the sum of its proper divisors (53611).

65398889 is a wasteful number, since it uses less digits than its factorization.

65398889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53610.

The product of its digits is 3732480, while the sum is 56.

The square root of 65398889 is about 8086.9579571060. The cubic root of 65398889 is about 402.8933726079.

The spelling of 65398889 in words is "sixty-five million, three hundred ninety-eight thousand, eight hundred eighty-nine".