990243072 has 216 divisors, whose sum is σ = 3514731584. Its totient is φ = 261107712.

The previous prime is 990243061. The next prime is 990243109. The reversal of 990243072 is 270342099.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 207303 + ... + 212025.

Almost surely, 2^990243072 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 990243072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1757365792).

990243072 is an abundant number, since it is smaller than the sum of its proper divisors (2524488512).

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

990243072 is a wasteful number, since it uses less digits than its factorization.

990243072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4765 (or 4748 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 990243072 is about 31468.1278756776. The cubic root of 990243072 is about 996.7370554394.

The spelling of 990243072 in words is "nine hundred ninety million, two hundred forty-three thousand, seventy-two".