9771327720 has 768 divisors, whose sum is σ = 41664430080. Its totient is φ = 1927065600.

The previous prime is 9771327653. The next prime is 9771327763. The reversal of 9771327720 is 277231779.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 71323492 + ... + 71323628.

It is an arithmetic number, because the mean of its divisors is an integer number (54250560).

Almost surely, 2^9771327720 is an apocalyptic number.

9771327720 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 9771327720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20832215040).

9771327720 is an abundant number, since it is smaller than the sum of its proper divisors (31893102360).

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

9771327720 is a wasteful number, since it uses less digits than its factorization.

9771327720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 259308, while the sum is 45.

The square root of 9771327720 is about 98850.0264036384. The cubic root of 9771327720 is about 2137.8859169826.

The spelling of 9771327720 in words is "nine billion, seven hundred seventy-one million, three hundred twenty-seven thousand, seven hundred twenty".