99689865 has 32 divisors (see below), whose sum is σ = 183168000. Its totient is φ = 45789120.

The previous prime is 99689861. The next prime is 99689897. The reversal of 99689865 is 56898699.

It is not a de Polignac number, because 99689865 - 2² = 99689861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99689799 and 99689808.

It is not an unprimeable number, because it can be changed into a prime (99689861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12765 + ... + 19034.

It is an arithmetic number, because the mean of its divisors is an integer number (5724000).

Almost surely, 2^99689865 is an apocalyptic number.

99689865 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

99689865 is a deficient number, since it is larger than the sum of its proper divisors (83478135).

99689865 is a wasteful number, since it uses less digits than its factorization.

99689865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31837.

The product of its digits is 8398080, while the sum is 60.

The square root of 99689865 is about 9984.4812083553. The cubic root of 99689865 is about 463.6785467369.

The spelling of 99689865 in words is "ninety-nine million, six hundred eighty-nine thousand, eight hundred sixty-five".