9865536720 has 160 divisors (see below), whose sum is σ = 33998490624. Its totient is φ = 2350080000.

The previous prime is 9865536719. The next prime is 9865536743. The reversal of 9865536720 is 276355689.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45720 + ... + 147720.

Almost surely, 2^9865536720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9865536720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16999245312).

9865536720 is an abundant number, since it is smaller than the sum of its proper divisors (24132953904).

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

9865536720 is a wasteful number, since it uses less digits than its factorization.

9865536720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102061 (or 102055 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 51.

The square root of 9865536720 is about 99325.4082297173. The cubic root of 9865536720 is about 2144.7346708612.

The spelling of 9865536720 in words is "nine billion, eight hundred sixty-five million, five hundred thirty-six thousand, seven hundred twenty".