9864786722 has 54 divisors (see below), whose sum is σ = 17572044987. Its totient is φ = 4141381608.

The previous prime is 9864786697. The next prime is 9864786731. The reversal of 9864786722 is 2276874689.

It can be written as a sum of positive squares in only one way, i.e., 4932393361 + 4932393361 = 70231^2 + 70231^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=70231.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 77675423 + ... + 77675549.

Almost surely, 2^9864786722 is an apocalyptic number.

9864786722 is a deficient number, since it is larger than the sum of its proper divisors (7707258265).

9864786722 is an equidigital number, since it uses as much as digits as its factorization.

9864786722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 215 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 59.

The square root of 9864786722 is about 99321.6326990248. The cubic root of 9864786722 is about 2144.6803204654.

The spelling of 9864786722 in words is "nine billion, eight hundred sixty-four million, seven hundred eighty-six thousand, seven hundred twenty-two".