9878542729 has 12 divisors (see below), whose sum is σ = 10915107840. Its totient is φ = 8933454200.

The previous prime is 9878542669. The next prime is 9878542741. The reversal of 9878542729 is 9272458789.

It is not a de Polignac number, because 9878542729 - 2¹¹ = 9878540681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9878542789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190609 + ... + 236830.

It is an arithmetic number, because the mean of its divisors is an integer number (909592320).

Almost surely, 2^9878542729 is an apocalyptic number.

It is an amenable number.

9878542729 is a deficient number, since it is larger than the sum of its proper divisors (1036565111).

9878542729 is a wasteful number, since it uses less digits than its factorization.

9878542729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427652 (or 427641 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 61.

The square root of 9878542729 is about 99390.8583774182. The cubic root of 9878542729 is about 2145.6767446071.

The spelling of 9878542729 in words is "nine billion, eight hundred seventy-eight million, five hundred forty-two thousand, seven hundred twenty-nine".