9789647720 has 32 divisors (see below), whose sum is σ = 22079065320. Its totient is φ = 3906551040.

The previous prime is 9789647713. The next prime is 9789647741. The reversal of 9789647720 is 277469879.

It can be written as a sum of positive squares in 4 ways, for example, as 2026980484 + 7762667236 = 45022^2 + 88106^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 9789647720.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273827 + ... + 307506.

Almost surely, 2^9789647720 is an apocalyptic number.

It is an amenable number.

9789647720 is an abundant number, since it is smaller than the sum of its proper divisors (12289417600).

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

9789647720 is a wasteful number, since it uses less digits than its factorization.

9789647720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581765 (or 581761 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 59.

The square root of 9789647720 is about 98942.6486405130. The cubic root of 9789647720 is about 2139.2211711550.

The spelling of 9789647720 in words is "nine billion, seven hundred eighty-nine million, six hundred forty-seven thousand, seven hundred twenty".