9120821776 has 80 divisors (see below), whose sum is σ = 20600110080. Its totient is φ = 3866019840.

The previous prime is 9120821729. The next prime is 9120821791. The reversal of 9120821776 is 6771280219.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312145 + ... + 340111.

It is an arithmetic number, because the mean of its divisors is an integer number (257501376).

Almost surely, 2^9120821776 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 9120821776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10300055040).

9120821776 is an abundant number, since it is smaller than the sum of its proper divisors (11479288304).

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

9120821776 is a wasteful number, since it uses less digits than its factorization.

9120821776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28112 (or 28106 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 9120821776 is about 95502.9935447052. The cubic root of 9120821776 is about 2089.3506049257.

The spelling of 9120821776 in words is "nine billion, one hundred twenty million, eight hundred twenty-one thousand, seven hundred seventy-six".