9900072 has 96 divisors (see below), whose sum is σ = 33022080. Its totient is φ = 2609280.

The previous prime is 9900047. The next prime is 9900091. The reversal of 9900072 is 2700099.

It is a super-2 number, since 2×9900072² = 196022851210368, which contains 22 as substring.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5797 + ... + 7307.

It is an arithmetic number, because the mean of its divisors is an integer number (343980).

Almost surely, 2^9900072 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 9900072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16511040).

9900072 is an abundant number, since it is smaller than the sum of its proper divisors (23122008).

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

9900072 is a wasteful number, since it uses less digits than its factorization.

9900072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543 (or 1536 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 9900072 is about 3146.4379860407. The cubic root of 9900072 is about 214.7234374410.

Adding to 9900072 its sum of digits (27), we get a palindrome (9900099).

The spelling of 9900072 in words is "nine million, nine hundred thousand, seventy-two".