9878105809 has 32 divisors (see below), whose sum is σ = 11778213888. Its totient is φ = 8166216000.

The previous prime is 9878105807. The next prime is 9878105837. The reversal of 9878105809 is 9085018789.

It is a cyclic number.

It is not a de Polignac number, because 9878105809 - 2¹ = 9878105807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9878105809.

It is not an unprimeable number, because it can be changed into a prime (9878105801) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 5114574 + ... + 5116504.

It is an arithmetic number, because the mean of its divisors is an integer number (368069184).

Almost surely, 2^9878105809 is an apocalyptic number.

It is an amenable number.

9878105809 is a deficient number, since it is larger than the sum of its proper divisors (1900108079).

9878105809 is a wasteful number, since it uses less digits than its factorization.

9878105809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469.

The product of its (nonzero) digits is 1451520, while the sum is 55.

The square root of 9878105809 is about 99388.6603642488. The cubic root of 9878105809 is about 2145.6451102885.

The spelling of 9878105809 in words is "nine billion, eight hundred seventy-eight million, one hundred five thousand, eight hundred nine".