9890658720 has 144 divisors (see below), whose sum is σ = 35219463552. Its totient is φ = 2522826240.

The previous prime is 9890658719. The next prime is 9890658727. The reversal of 9890658720 is 278560989.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (9890658727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116196 + ... + 182435.

It is an arithmetic number, because the mean of its divisors is an integer number (244579608).

Almost surely, 2^9890658720 is an apocalyptic number.

9890658720 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9890658720 is an abundant number, since it is smaller than the sum of its proper divisors (25328804832).

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

9890658720 is a wasteful number, since it uses less digits than its factorization.

9890658720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298675 (or 298664 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The square root of 9890658720 is about 99451.7909341003. The cubic root of 9890658720 is about 2146.5536073750.

The spelling of 9890658720 in words is "nine billion, eight hundred ninety million, six hundred fifty-eight thousand, seven hundred twenty".