9878989797 has 12 divisors (see below), whose sum is σ = 14798157920. Its totient is φ = 6585993036.

The previous prime is 9878989777. The next prime is 9878989801. The reversal of 9878989797 is 7979898789.

It is not a de Polignac number, because 9878989797 - 2¹⁵ = 9878957029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9878989727) 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 11 ways as a sum of consecutive naturals, for example, 20326897 + ... + 20327382.

Almost surely, 2^9878989797 is an apocalyptic number.

It is an amenable number.

9878989797 is a deficient number, since it is larger than the sum of its proper divisors (4919168123).

9878989797 is an equidigital number, since it uses as much as digits as its factorization.

9878989797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40654294 (or 40654282 counting only the distinct ones).

The product of its digits is 1152216576, while the sum is 81.

The square root of 9878989797 is about 99393.1073918106. The cubic root of 9878989797 is about 2145.7091127059.

The spelling of 9878989797 in words is "nine billion, eight hundred seventy-eight million, nine hundred eighty-nine thousand, seven hundred ninety-seven".