9777866688 has 84 divisors (see below), whose sum is σ = 28053593880. Its totient is φ = 3256137216.

The previous prime is 9777866687. The next prime is 9777866713. The reversal of 9777866688 is 8866687779.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9777866687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 631131 + ... + 646437.

Almost surely, 2^9777866688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9777866688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14026796940).

9777866688 is an abundant number, since it is smaller than the sum of its proper divisors (18275727192).

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

9777866688 is a wasteful number, since it uses less digits than its factorization.

9777866688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16434 (or 16421 counting only the distinct ones).

The product of its digits is 341397504, while the sum is 72.

The square root of 9777866688 is about 98883.0960680338. The cubic root of 9777866688 is about 2138.3627014001.

The spelling of 9777866688 in words is "nine billion, seven hundred seventy-seven million, eight hundred sixty-six thousand, six hundred eighty-eight".