9869645720 has 96 divisors (see below), whose sum is σ = 24443218800. Its totient is φ = 3583937280.

The previous prime is 9869645711. The next prime is 9869645813. The reversal of 9869645720 is 275469689.

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 23 ways as a sum of consecutive naturals, for example, 6905966 + ... + 6907394.

Almost surely, 2^9869645720 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 9869645720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12221609400).

9869645720 is an abundant number, since it is smaller than the sum of its proper divisors (14573573080).

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

9869645720 is a wasteful number, since it uses less digits than its factorization.

9869645720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889 (or 2874 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 56.

The square root of 9869645720 is about 99346.0906125651. The cubic root of 9869645720 is about 2145.0323904817.

The spelling of 9869645720 in words is "nine billion, eight hundred sixty-nine million, six hundred forty-five thousand, seven hundred twenty".