9889875778 has 4 divisors (see below), whose sum is σ = 14834813670. Its totient is φ = 4944937888.

The previous prime is 9889875757. The next prime is 9889875833. The reversal of 9889875778 is 8775789889.

9889875778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7504237129 + 2385638649 = 86627^2 + 48843^2 .

It is a super-2 number, since 2×9889875778² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2472468943 + ... + 2472468946.

Almost surely, 2^9889875778 is an apocalyptic number.

9889875778 is a deficient number, since it is larger than the sum of its proper divisors (4944937892).

9889875778 is a wasteful number, since it uses less digits than its factorization.

9889875778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4944937891.

The product of its digits is 568995840, while the sum is 76.

The square root of 9889875778 is about 99447.8545671047. The cubic root of 9889875778 is about 2146.4969656699.

The spelling of 9889875778 in words is "nine billion, eight hundred eighty-nine million, eight hundred seventy-five thousand, seven hundred seventy-eight".