9999828 has 48 divisors (see below), whose sum is σ = 26429760. Its totient is φ = 3268512.

The previous prime is 9999823. The next prime is 9999863. The reversal of 9999828 is 8289999.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999823) 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 15 ways as a sum of consecutive naturals, for example, 4851 + ... + 6597.

It is an arithmetic number, because the mean of its divisors is an integer number (550620).

Almost surely, 2^9999828 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 9999828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13214880).

9999828 is an abundant number, since it is smaller than the sum of its proper divisors (16429932).

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

9999828 is a wasteful number, since it uses less digits than its factorization.

9999828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813 (or 1805 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 9999828 is about 3162.2504644636. The cubic root of 9999828 is about 215.4422337869.

The spelling of 9999828 in words is "nine million, nine hundred ninety-nine thousand, eight hundred twenty-eight".