99640323 has 24 divisors (see below), whose sum is σ = 147186000. Its totient is φ = 64937664.

The previous prime is 99640309. The next prime is 99640327. The reversal of 99640323 is 32304699.

It is a happy number.

99640323 is a `hidden beast` number, since 9 + 9 + 640 + 3 + 2 + 3 = 666.

It is a Cunningham number, because it is equal to 9982²-1.

It is not a de Polignac number, because 99640323 - 2⁸ = 99640067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99640327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89293 + ... + 90401.

It is an arithmetic number, because the mean of its divisors is an integer number (6132750).

Almost surely, 2^99640323 is an apocalyptic number.

99640323 is a deficient number, since it is larger than the sum of its proper divisors (47545677).

99640323 is a wasteful number, since it uses less digits than its factorization.

99640323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331 (or 1328 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 99640323 is about 9981.9999499098. Note that the first 4 decimals coincide. The cubic root of 99640323 is about 463.6017239193.

The spelling of 99640323 in words is "ninety-nine million, six hundred forty thousand, three hundred twenty-three".