8991540432 has 240 divisors, whose sum is σ = 30275062272. Its totient is φ = 2530154880.

The previous prime is 8991540419. The next prime is 8991540463. The reversal of 8991540432 is 2340451998.

8991540432 is a `hidden beast` number, since 89 + 91 + 54 + 0 + 432 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1821007 + ... + 1825937.

Almost surely, 2^8991540432 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 8991540432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15137531136).

8991540432 is an abundant number, since it is smaller than the sum of its proper divisors (21283521840).

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

8991540432 is a wasteful number, since it uses less digits than its factorization.

8991540432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5028 (or 5010 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 8991540432 is about 94823.7334848191. The cubic root of 8991540432 is about 2079.4318924315.

The spelling of 8991540432 in words is "eight billion, nine hundred ninety-one million, five hundred forty thousand, four hundred thirty-two".