28887999 has 24 divisors (see below), whose sum is σ = 47168640. Its totient is φ = 15637104.

The previous prime is 28887979. The next prime is 28888003. The reversal of 28887999 is 99978882.

It is not a de Polignac number, because 28887999 - 2⁷ = 28887871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28887979) 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, 2379 + ... + 7964.

It is an arithmetic number, because the mean of its divisors is an integer number (1965360).

Almost surely, 2^28887999 is an apocalyptic number.

28887999 is a deficient number, since it is larger than the sum of its proper divisors (18280641).

28887999 is a wasteful number, since it uses less digits than its factorization.

28887999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10379 (or 10372 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 60.

The square root of 28887999 is about 5374.7557153791. The cubic root of 28887999 is about 306.8356521131.

The spelling of 28887999 in words is "twenty-eight million, eight hundred eighty-seven thousand, nine hundred ninety-nine".