28889999 has 8 divisors (see below), whose sum is σ = 29487120. Its totient is φ = 28296576.

The previous prime is 28889989. The next prime is 28890031. The reversal of 28889999 is 99998882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28889999 - 2⁸ = 28889743 is a prime.

It is a Duffinian number.

28889999 is a modest number, since divided by 9999 gives 2888 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 (28889989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19157 + ... + 20609.

It is an arithmetic number, because the mean of its divisors is an integer number (3685890).

Almost surely, 2^28889999 is an apocalyptic number.

28889999 is a deficient number, since it is larger than the sum of its proper divisors (597121).

28889999 is a wasteful number, since it uses less digits than its factorization.

28889999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849.

The product of its digits is 6718464, while the sum is 62.

The square root of 28889999 is about 5374.9417671264. The cubic root of 28889999 is about 306.8427329905.

The spelling of 28889999 in words is "twenty-eight million, eight hundred eighty-nine thousand, nine hundred ninety-nine".