28785999 has 16 divisors (see below), whose sum is σ = 41969664. Its totient is φ = 17404800.

The previous prime is 28785983. The next prime is 28786001. The reversal of 28785999 is 99958782.

It is not a de Polignac number, because 28785999 - 2⁴ = 28785983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28785929) 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 15 ways as a sum of consecutive naturals, for example, 18834 + ... + 20304.

It is an arithmetic number, because the mean of its divisors is an integer number (2623104).

Almost surely, 2^28785999 is an apocalyptic number.

28785999 is a deficient number, since it is larger than the sum of its proper divisors (13183665).

28785999 is a wasteful number, since it uses less digits than its factorization.

28785999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078.

The product of its digits is 3265920, while the sum is 57.

The square root of 28785999 is about 5365.2585212644. The cubic root of 28785999 is about 306.4740931543.

The spelling of 28785999 in words is "twenty-eight million, seven hundred eighty-five thousand, nine hundred ninety-nine".