89666999 has 4 divisors (see below), whose sum is σ = 89685960. Its totient is φ = 89648040.

The previous prime is 89666987. The next prime is 89667001. The reversal of 89666999 is 99966698.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89666999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89666399) 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, 4064 + ... + 13994.

It is an arithmetic number, because the mean of its divisors is an integer number (22421490).

Almost surely, 2^89666999 is an apocalyptic number.

89666999 is a deficient number, since it is larger than the sum of its proper divisors (18961).

89666999 is an equidigital number, since it uses as much as digits as its factorization.

89666999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18960.

The product of its digits is 11337408, while the sum is 62.

The square root of 89666999 is about 9469.2660222427. The cubic root of 89666999 is about 447.5870833303.

The spelling of 89666999 in words is "eighty-nine million, six hundred sixty-six thousand, nine hundred ninety-nine".