9894678784 has 27 divisors (see below), whose sum is σ = 19753883877. Its totient is φ = 4946543616.

The previous prime is 9894678757. The next prime is 9894678823. The reversal of 9894678784 is 4878764989.

The square root of 9894678784 is 99472.

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., 7286329600 + 2608349184 = 85360^2 + 51072^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1588444 + ... + 1594660.

Almost surely, 2^9894678784 is an apocalyptic number.

9894678784 is the 99472-nd square number.

It is an amenable number.

9894678784 is a deficient number, since it is larger than the sum of its proper divisors (9859205093).

9894678784 is an frugal number, since it uses more digits than its factorization.

9894678784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12450 (or 6219 counting only the distinct ones).

The product of its digits is 195084288, while the sum is 70.

The cubic root of 9894678784 is about 2146.8443906370.

The spelling of 9894678784 in words is "nine billion, eight hundred ninety-four million, six hundred seventy-eight thousand, seven hundred eighty-four".