99645 has 32 divisors (see below), whose sum is σ = 198912. Its totient is φ = 41472.

The previous prime is 99643. The next prime is 99661. The reversal of 99645 is 54699.

It is a happy number.

It is not a de Polignac number, because 99645 - 2¹ = 99643 is a prime.

99645 is an undulating number in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1329 + ... + 1401.

It is an arithmetic number, because the mean of its divisors is an integer number (6216).

2⁹⁹⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

99645 is a deficient number, since it is larger than the sum of its proper divisors (99267).

99645 is a wasteful number, since it uses less digits than its factorization.

99645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101.

The product of its digits is 9720, while the sum is 33.

The square root of 99645 is about 315.6659626884. The cubic root of 99645 is about 46.3608977446.

The spelling of 99645 in words is "ninety-nine thousand, six hundred forty-five".