99999428 has 12 divisors (see below), whose sum is σ = 180644352. Its totient is φ = 48386760.

The previous prime is 99999401. The next prime is 99999437. The reversal of 99999428 is 82499999.

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 in 3 ways as a sum of consecutive naturals, for example, 403100 + ... + 403347.

It is an arithmetic number, because the mean of its divisors is an integer number (15053696).

Almost surely, 2^99999428 is an apocalyptic number.

It is an amenable number.

99999428 is a deficient number, since it is larger than the sum of its proper divisors (80644924).

99999428 is a wasteful number, since it uses less digits than its factorization.

99999428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806482 (or 806480 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 59.

The square root of 99999428 is about 9999.9713999591. The cubic root of 99999428 is about 464.1579983633.

The spelling of 99999428 in words is "ninety-nine million, nine hundred ninety-nine thousand, four hundred twenty-eight".