9898987806 has 40 divisors (see below), whose sum is σ = 22377399264. Its totient is φ = 3270456000.

The previous prime is 9898987799. The next prime is 9898987811. The reversal of 9898987806 is 6087898989.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 252070 + ... + 288681.

Almost surely, 2^9898987806 is an apocalyptic number.

9898987806 is an abundant number, since it is smaller than the sum of its proper divisors (12478411458).

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

9898987806 is a wasteful number, since it uses less digits than its factorization.

9898987806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540878 (or 540869 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 72.

The square root of 9898987806 is about 99493.6571144111. The cubic root of 9898987806 is about 2147.1559876534.

The spelling of 9898987806 in words is "nine billion, eight hundred ninety-eight million, nine hundred eighty-seven thousand, eight hundred six".