99894771988 has 36 divisors (see below), whose sum is σ = 200507459040. Its totient is φ = 43432504720.

The previous prime is 99894771979. The next prime is 99894771989. The reversal of 99894771988 is 88917749899.

It is a super-4 number, since 4×99894771988⁴ (a number of 45 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99894771989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4475698 + ... + 4497961.

It is an arithmetic number, because the mean of its divisors is an integer number (5569651640).

Almost surely, 2^99894771988 is an apocalyptic number.

It is an amenable number.

99894771988 is an abundant number, since it is smaller than the sum of its proper divisors (100612687052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99894771988 is a wasteful number, since it uses less digits than its factorization.

99894771988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8973708 (or 8973695 counting only the distinct ones).

The product of its digits is 658409472, while the sum is 79.

The spelling of 99894771988 in words is "ninety-nine billion, eight hundred ninety-four million, seven hundred seventy-one thousand, nine hundred eighty-eight".