9990064720 has 80 divisors (see below), whose sum is σ = 25512474240. Its totient is φ = 3621100032.

The previous prime is 9990064661. The next prime is 9990064723. The reversal of 9990064720 is 274600999.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990064723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107919 + ... + 177838.

It is an arithmetic number, because the mean of its divisors is an integer number (318905928).

Almost surely, 2^9990064720 is an apocalyptic number.

It is an amenable number.

9990064720 is an abundant number, since it is smaller than the sum of its proper divisors (15522409520).

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

9990064720 is a wasteful number, since it uses less digits than its factorization.

9990064720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285812 (or 285806 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 9990064720 is about 99950.3112551432. The cubic root of 9990064720 is about 2153.7209565454.

The spelling of 9990064720 in words is "nine billion, nine hundred ninety million, sixty-four thousand, seven hundred twenty".