9898787898 has 20 divisors (see below), whose sum is σ = 22180617690. Its totient is φ = 3299595912.

The previous prime is 9898787807. The next prime is 9898787981. The reversal of 9898787898 is 8987878989.

9898787898 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in only one way, i.e., 8891169849 + 1007618049 = 94293^2 + 31743^2 .

It is a Harshad number since it is a multiple of its sum of digits (81).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 30551653 + ... + 30551976.

Almost surely, 2^9898787898 is an apocalyptic number.

9898787898 is an abundant number, since it is smaller than the sum of its proper divisors (12281829792).

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

9898787898 is a wasteful number, since it uses less digits than its factorization.

9898787898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61103643 (or 61103634 counting only the distinct ones).

The product of its digits is 1170505728, while the sum is 81.

The square root of 9898787898 is about 99492.6524824823. The cubic root of 9898787898 is about 2147.1415337666.

The spelling of 9898787898 in words is "nine billion, eight hundred ninety-eight million, seven hundred eighty-seven thousand, eight hundred ninety-eight".