28788899 has 4 divisors (see below), whose sum is σ = 28874664. Its totient is φ = 28703136.

The previous prime is 28788869. The next prime is 28788901. The reversal of 28788899 is 99888782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28788899 - 2¹² = 28784803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28788829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42377 + ... + 43050.

It is an arithmetic number, because the mean of its divisors is an integer number (7218666).

Almost surely, 2^28788899 is an apocalyptic number.

28788899 is a deficient number, since it is larger than the sum of its proper divisors (85765).

28788899 is an equidigital number, since it uses as much as digits as its factorization.

28788899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85764.

The product of its digits is 4644864, while the sum is 59.

The square root of 28788899 is about 5365.5287717055. The cubic root of 28788899 is about 306.4843845582.

The spelling of 28788899 in words is "twenty-eight million, seven hundred eighty-eight thousand, eight hundred ninety-nine".