9985454878 has 16 divisors (see below), whose sum is σ = 17119204704. Its totient is φ = 4279160160.

The previous prime is 9985454827. The next prime is 9985454891. The reversal of 9985454878 is 8784545899.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355468 + ... + 382528.

It is an arithmetic number, because the mean of its divisors is an integer number (1069950294).

Almost surely, 2^9985454878 is an apocalyptic number.

9985454878 is a deficient number, since it is larger than the sum of its proper divisors (7133749826).

9985454878 is a wasteful number, since it uses less digits than its factorization.

9985454878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53427.

The product of its digits is 116121600, while the sum is 67.

The square root of 9985454878 is about 99927.2479256784. The cubic root of 9985454878 is about 2153.3896326715.

The spelling of 9985454878 in words is "nine billion, nine hundred eighty-five million, four hundred fifty-four thousand, eight hundred seventy-eight".