8991488772 has 36 divisors (see below), whose sum is σ = 25975412736. Its totient is φ = 2568996720.

The previous prime is 8991488729. The next prime is 8991488783. The reversal of 8991488772 is 2778841998.

8991488772 is a `hidden beast` number, since 89 + 9 + 1 + 488 + 7 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17840004 + ... + 17840507.

Almost surely, 2^8991488772 is an apocalyptic number.

It is an amenable number.

8991488772 is an abundant number, since it is smaller than the sum of its proper divisors (16983923964).

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

8991488772 is a wasteful number, since it uses less digits than its factorization.

8991488772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35680528 (or 35680523 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 63.

The square root of 8991488772 is about 94823.4610842696. The cubic root of 8991488772 is about 2079.4279100343.

The spelling of 8991488772 in words is "eight billion, nine hundred ninety-one million, four hundred eighty-eight thousand, seven hundred seventy-two".