8991720952 has 8 divisors (see below), whose sum is σ = 16859476800. Its totient is φ = 4495860472.

The previous prime is 8991720929. The next prime is 8991720973. The reversal of 8991720952 is 2590271998.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 8991720952.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561982552 + ... + 561982567.

It is an arithmetic number, because the mean of its divisors is an integer number (2107434600).

Almost surely, 2^8991720952 is an apocalyptic number.

It is an amenable number.

8991720952 is a deficient number, since it is larger than the sum of its proper divisors (7867755848).

8991720952 is a wasteful number, since it uses less digits than its factorization.

8991720952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123965125 (or 1123965121 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 8991720952 is about 94824.6853514421. The cubic root of 8991720952 is about 2079.4458083464.

The spelling of 8991720952 in words is "eight billion, nine hundred ninety-one million, seven hundred twenty thousand, nine hundred fifty-two".