8891661988 has 24 divisors (see below), whose sum is σ = 16979516064. Its totient is φ = 4040587200.

The previous prime is 8891661979. The next prime is 8891662057.

8891661988 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×8891661988² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153603 + ... + 203413.

It is an arithmetic number, because the mean of its divisors is an integer number (707479836).

Almost surely, 2^8891661988 is an apocalyptic number.

It is an amenable number.

8891661988 is a deficient number, since it is larger than the sum of its proper divisors (8087854076).

8891661988 is a wasteful number, since it uses less digits than its factorization.

8891661988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53883 (or 53881 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 64.

The square root of 8891661988 is about 94295.6095902667. The cubic root of 8891661988 is about 2071.7037314975.

The spelling of 8891661988 in words is "eight billion, eight hundred ninety-one million, six hundred sixty-one thousand, nine hundred eighty-eight".