9898427690040 has 128 divisors (see below), whose sum is σ = 30725254886400. Its totient is φ = 2548063203840.

The previous prime is 9898427690009. The next prime is 9898427690057. The reversal of 9898427690040 is 400967248989.

It is a super-2 number, since 2×9898427690040² (a number of 27 digits) contains 22 as substring.

It is a congruent 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 31 ways as a sum of consecutive naturals, for example, 17720049 + ... + 18270111.

It is an arithmetic number, because the mean of its divisors is an integer number (240041053800).

Almost surely, 2^{9898427690040} 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 9898427690040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15362627443200).

9898427690040 is an abundant number, since it is smaller than the sum of its proper divisors (20826827196360).

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

9898427690040 is a wasteful number, since it uses less digits than its factorization.

9898427690040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555277 (or 555273 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 66.

The spelling of 9898427690040 in words is "nine trillion, eight hundred ninety-eight billion, four hundred twenty-seven million, six hundred ninety thousand, forty".