99999928 has 16 divisors (see below), whose sum is σ = 214285680. Its totient is φ = 42857088.

The previous prime is 99999847. The next prime is 99999931. The reversal of 99999928 is 82999999.

It is a self number, because there is not a number n which added to its sum of digits gives 99999928.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892801 + ... + 892912.

It is an arithmetic number, because the mean of its divisors is an integer number (13392855).

Almost surely, 2^99999928 is an apocalyptic number.

It is an amenable number.

99999928 is an abundant number, since it is smaller than the sum of its proper divisors (114285752).

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

99999928 is a wasteful number, since it uses less digits than its factorization.

99999928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785726 (or 1785722 counting only the distinct ones).

The product of its digits is 8503056, while the sum is 64.

The square root of 99999928 is about 9999.9963999994. The cubic root of 99999928 is about 464.1587719631.

It can be divided in two parts, 9999992 and 8, that added together give a 7-th power (10000000 = 10⁷).

The spelling of 99999928 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred twenty-eight".