9761988820 has 48 divisors (see below), whose sum is σ = 20734514640. Its totient is φ = 3860250624.

The previous prime is 9761988793. The next prime is 9761988823. The reversal of 9761988820 is 288891679.

It can be written as a sum of positive squares in 8 ways, for example, as 539075524 + 9222913296 = 23218^2 + 96036^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9761988823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2188032 + ... + 2192488.

It is an arithmetic number, because the mean of its divisors is an integer number (431969055).

Almost surely, 2^9761988820 is an apocalyptic number.

It is an amenable number.

9761988820 is an abundant number, since it is smaller than the sum of its proper divisors (10972525820).

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

9761988820 is a wasteful number, since it uses less digits than its factorization.

9761988820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5692 (or 5690 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 58.

The square root of 9761988820 is about 98802.7773901119. Note that the first 3 decimals coincide. The cubic root of 9761988820 is about 2137.2046084513.

The spelling of 9761988820 in words is "nine billion, seven hundred sixty-one million, nine hundred eighty-eight thousand, eight hundred twenty".