8991355968 has 112 divisors (see below), whose sum is σ = 30209093760. Its totient is φ = 2568955392.

The previous prime is 8991355963. The next prime is 8991355969. The reversal of 8991355968 is 8695531998.

8991355968 is a `hidden beast` number, since 8 + 9 + 9 + 1 + 35 + 596 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (112).

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

It is not an unprimeable number, because it can be changed into a prime (8991355963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359571 + ... + 383762.

Almost surely, 2^8991355968 is an apocalyptic number.

It is an amenable number.

8991355968 is an abundant number, since it is smaller than the sum of its proper divisors (21217737792).

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

8991355968 is a wasteful number, since it uses less digits than its factorization.

8991355968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743361 (or 743345 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 63.

The square root of 8991355968 is about 94822.7608119485. The cubic root of 8991355968 is about 2079.4176722894.

The spelling of 8991355968 in words is "eight billion, nine hundred ninety-one million, three hundred fifty-five thousand, nine hundred sixty-eight".