84108865 has 4 divisors (see below), whose sum is σ = 100930644. Its totient is φ = 67287088.

The previous prime is 84108863. The next prime is 84108923. The reversal of 84108865 is 56880148.

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 14753281 + 69355584 = 3841^2 + 8328^2 .

It is a cyclic number.

It is not a de Polignac number, because 84108865 - 2¹ = 84108863 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84108863) 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, 8410882 + ... + 8410891.

It is an arithmetic number, because the mean of its divisors is an integer number (25232661).

Almost surely, 2^84108865 is an apocalyptic number.

It is an amenable number.

84108865 is a deficient number, since it is larger than the sum of its proper divisors (16821779).

84108865 is a wasteful number, since it uses less digits than its factorization.

84108865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16821778.

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 84108865 is about 9171.0885395355. The cubic root of 84108865 is about 438.1410292785.

The spelling of 84108865 in words is "eighty-four million, one hundred eight thousand, eight hundred sixty-five".