99999564 has 48 divisors (see below), whose sum is σ = 268063488.
Its totient is φ = 28421568.
The previous prime is 99999563. The next prime is 99999587. The reversal of 99999564 is 46599999.
It is a junction number, because it is equal to n+sod(n) for n = 99999498 and 99999507.
It is not an unprimeable number, because it can be changed into a prime (99999563) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13527 + ... + 19569.
It is an arithmetic number, because the mean of its divisors is an integer number (5584656).
Almost surely, 299999564 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 99999564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134031744).
99999564 is an abundant number, since it is smaller than the sum of its proper divisors (168063924).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
99999564 is a wasteful number, since it uses less digits than its factorization.
99999564 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6254 (or 6252 counting only the distinct ones).
The product of its digits is 7085880, while the sum is 60.
The square root of 99999564 is about 9999.9781999762.
The cubic root of 99999564 is about 464.1582087827.
The spelling of 99999564 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred sixty-four".