9807881840 has 20 divisors (see below), whose sum is σ = 22803325464. Its totient is φ = 3923152704.

The previous prime is 9807881827. The next prime is 9807881849. The reversal of 9807881840 is 481887089.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9807881849) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 61299182 + ... + 61299341.

Almost surely, 2^9807881840 is an apocalyptic number.

It is an amenable number.

9807881840 is an abundant number, since it is smaller than the sum of its proper divisors (12995443624).

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

9807881840 is a wasteful number, since it uses less digits than its factorization.

9807881840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122598536 (or 122598530 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 53.

The square root of 9807881840 is about 99034.7506686416. The cubic root of 9807881840 is about 2140.5485128449.

The spelling of 9807881840 in words is "nine billion, eight hundred seven million, eight hundred eighty-one thousand, eight hundred forty".