99540644 has 48 divisors (see below), whose sum is σ = 218090880. Its totient is φ = 38760960.

The previous prime is 99540643. The next prime is 99540691. The reversal of 99540644 is 44604599.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (99540643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10199 + ... + 17409.

It is an arithmetic number, because the mean of its divisors is an integer number (4543560).

Almost surely, 2^99540644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99540644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109045440).

99540644 is an abundant number, since it is smaller than the sum of its proper divisors (118550236).

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

99540644 is a wasteful number, since it uses less digits than its factorization.

99540644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7268 (or 7266 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 99540644 is about 9977.0057632538. The cubic root of 99540644 is about 463.4470784465.

The spelling of 99540644 in words is "ninety-nine million, five hundred forty thousand, six hundred forty-four".