9985323840 has 112 divisors (see below), whose sum is σ = 33372064320. Its totient is φ = 2522603520.

The previous prime is 9985323833. The next prime is 9985323841. The reversal of 9985323840 is 483235899.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9985323841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255481 + ... + 291960.

It is an arithmetic number, because the mean of its divisors is an integer number (297964860).

Almost surely, 2^9985323840 is an apocalyptic number.

It is an amenable number.

9985323840 is an abundant number, since it is smaller than the sum of its proper divisors (23386740480).

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

9985323840 is a wasteful number, since it uses less digits than its factorization.

9985323840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547480 (or 547470 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The square root of 9985323840 is about 99926.5922565160. The cubic root of 9985323840 is about 2153.3802130671.

The spelling of 9985323840 in words is "nine billion, nine hundred eighty-five million, three hundred twenty-three thousand, eight hundred forty".