9681772816 has 45 divisors (see below), whose sum is σ = 19940560869. Its totient is φ = 4552979712.

The previous prime is 9681772811. The next prime is 9681772817. The reversal of 9681772816 is 6182771869.

The square root of 9681772816 is 98396.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7537712400 + 2144060416 = 86820^2 + 46304^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9681772811) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6690205 + ... + 6691651.

Almost surely, 2^9681772816 is an apocalyptic number.

9681772816 is the 98396-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9681772816

9681772816 is an abundant number, since it is smaller than the sum of its proper divisors (10258788053).

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

9681772816 is an equidigital number, since it uses as much as digits as its factorization.

9681772816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936 (or 1466 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 55.

The cubic root of 9681772816 is about 2131.3345700471.

The spelling of 9681772816 in words is "nine billion, six hundred eighty-one million, seven hundred seventy-two thousand, eight hundred sixteen".