99640448 has 32 divisors (see below), whose sum is σ = 204913920. Its totient is φ = 48211200.

The previous prime is 99640441. The next prime is 99640459. The reversal of 99640448 is 84404699.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 99640399 and 99640408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99640441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8588 + ... + 16523.

It is an arithmetic number, because the mean of its divisors is an integer number (6403560).

Almost surely, 2^99640448 is an apocalyptic number.

It is an amenable number.

99640448 is an abundant number, since it is smaller than the sum of its proper divisors (105273472).

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

99640448 is a wasteful number, since it uses less digits than its factorization.

99640448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25156 (or 25144 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 99640448 is about 9982.0062111782. The cubic root of 99640448 is about 463.6019177839.

The spelling of 99640448 in words is "ninety-nine million, six hundred forty thousand, four hundred forty-eight".