9988650 has 144 divisors (see below), whose sum is σ = 32230080. Its totient is φ = 2268000.

The previous prime is 9988633. The next prime is 9988687. The reversal of 9988650 is 568899.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9988596 and 9988605.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 66075 + ... + 66225.

It is an arithmetic number, because the mean of its divisors is an integer number (223820).

Almost surely, 2^9988650 is an apocalyptic number.

9988650 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9988650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16115040).

9988650 is an abundant number, since it is smaller than the sum of its proper divisors (22241430).

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

9988650 is a wasteful number, since it uses less digits than its factorization.

9988650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 9988650 is about 3160.4825580914. The cubic root of 9988650 is about 215.3619287002.

The spelling of 9988650 in words is "nine million, nine hundred eighty-eight thousand, six hundred fifty".