28899999 has 24 divisors (see below), whose sum is σ = 43552080. Its totient is φ = 18450432.

The previous prime is 28899973. The next prime is 28900057. The reversal of 28899999 is 99999882.

It is not a de Polignac number, because 28899999 - 2⁸ = 28899743 is a prime.

28899999 is a modest number, since divided by 9999 gives 2889 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28899929) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 19807 + ... + 21215.

It is an arithmetic number, because the mean of its divisors is an integer number (1814670).

Almost surely, 2^28899999 is an apocalyptic number.

28899999 is a deficient number, since it is larger than the sum of its proper divisors (14652081).

28899999 is a wasteful number, since it uses less digits than its factorization.

28899999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511 (or 1508 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 63.

The square root of 28899999 is about 5375.8719292781. The cubic root of 28899999 is about 306.8781324767.

The spelling of 28899999 in words is "twenty-eight million, eight hundred ninety-nine thousand, nine hundred ninety-nine".