9998628775 has 6 divisors (see below), whose sum is σ = 12398299712. Its totient is φ = 7998903000.

The previous prime is 9998628763. The next prime is 9998628791. The reversal of 9998628775 is 5778268999.

It is not a de Polignac number, because 9998628775 - 2¹¹ = 9998626727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 199972551 + ... + 199972600.

Almost surely, 2^9998628775 is an apocalyptic number.

9998628775 is a deficient number, since it is larger than the sum of its proper divisors (2399670937).

9998628775 is a wasteful number, since it uses less digits than its factorization.

9998628775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399945161 (or 399945156 counting only the distinct ones).

The product of its digits is 137168640, while the sum is 70.

The square root of 9998628775 is about 99993.1436399516. The cubic root of 9998628775 is about 2154.3362117070.

The spelling of 9998628775 in words is "nine billion, nine hundred ninety-eight million, six hundred twenty-eight thousand, seven hundred seventy-five".