9987654320 has 120 divisors (see below), whose sum is σ = 28187240544. Its totient is φ = 3275424768.

The previous prime is 9987654263. The next prime is 9987654329. The reversal of 9987654320 is 234567899.

It is a happy number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9987654329) 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, 34772 + ... + 145548.

Almost surely, 2^9987654320 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 9987654320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14093620272).

9987654320 is an abundant number, since it is smaller than the sum of its proper divisors (18199586224).

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

9987654320 is a wasteful number, since it uses less digits than its factorization.

9987654320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110827 (or 110814 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 53.

The square root of 9987654320 is about 99938.2525362536. The cubic root of 9987654320 is about 2153.5477262172.

The spelling of 9987654320 in words is "nine billion, nine hundred eighty-seven million, six hundred fifty-four thousand, three hundred twenty".