99640836 has 36 divisors (see below), whose sum is σ = 254912112. Its totient is φ = 32812464.

The previous prime is 99640831. The next prime is 99640873. The reversal of 99640836 is 63804699.

It is a tau number, because it is divible by the number of its divisors (36).

99640836 is a modest number, since divided by 40836 gives 996 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 99640791 and 99640800.

It is not an unprimeable number, because it can be changed into a prime (99640831) 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 11 ways as a sum of consecutive naturals, for example, 13686 + ... + 19661.

It is an arithmetic number, because the mean of its divisors is an integer number (7080892).

Almost surely, 2^99640836 is an apocalyptic number.

It is an amenable number.

99640836 is an abundant number, since it is smaller than the sum of its proper divisors (155271276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99640836 is a wasteful number, since it uses less digits than its factorization.

99640836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33440 (or 33435 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 99640836 is about 9982.0256461301. The cubic root of 99640836 is about 463.6025195386.

The spelling of 99640836 in words is "ninety-nine million, six hundred forty thousand, eight hundred thirty-six".