8688640988 has 6 divisors (see below), whose sum is σ = 15205121736. Its totient is φ = 4344320492.

The previous prime is 8688640951. The next prime is 8688640991. The reversal of 8688640988 is 8890468868.

It is a super-2 number, since 2×8688640988² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086080120 + ... + 1086080127.

It is an arithmetic number, because the mean of its divisors is an integer number (2534186956).

Almost surely, 2^8688640988 is an apocalyptic number.

It is an amenable number.

8688640988 is a deficient number, since it is larger than the sum of its proper divisors (6516480748).

8688640988 is a wasteful number, since it uses less digits than its factorization.

8688640988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172160251 (or 2172160249 counting only the distinct ones).

The product of its (nonzero) digits is 42467328, while the sum is 65.

The square root of 8688640988 is about 93212.8799469258. The cubic root of 8688640988 is about 2055.8146231117.

The spelling of 8688640988 in words is "eight billion, six hundred eighty-eight million, six hundred forty thousand, nine hundred eighty-eight".