9771986880 has 224 divisors, whose sum is σ = 34781947200. Its totient is φ = 2582544384.

The previous prime is 9771986879. The next prime is 9771986891. The reversal of 9771986880 is 886891779.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 971316 + ... + 981324.

It is an arithmetic number, because the mean of its divisors is an integer number (155276550).

Almost surely, 2^9771986880 is an apocalyptic number.

9771986880 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9771986880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17390973600).

9771986880 is an abundant number, since it is smaller than the sum of its proper divisors (25009960320).

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

9771986880 is a wasteful number, since it uses less digits than its factorization.

9771986880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10148 (or 10132 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 63.

The square root of 9771986880 is about 98853.3604891609. The cubic root of 9771986880 is about 2137.9339888256.

The spelling of 9771986880 in words is "nine billion, seven hundred seventy-one million, nine hundred eighty-six thousand, eight hundred eighty".