28887787 has 16 divisors (see below), whose sum is σ = 30925312. Its totient is φ = 26943840.

The previous prime is 28887773. The next prime is 28887797. The reversal of 28887787 is 78778882.

It is a cyclic number.

It is not a de Polignac number, because 28887787 - 2¹¹ = 28885739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28887707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106462 + ... + 106732.

It is an arithmetic number, because the mean of its divisors is an integer number (1932832).

Almost surely, 2^28887787 is an apocalyptic number.

28887787 is a deficient number, since it is larger than the sum of its proper divisors (2037525).

28887787 is a wasteful number, since it uses less digits than its factorization.

28887787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418.

The product of its digits is 2809856, while the sum is 55.

The square root of 28887787 is about 5374.7359935163. The cubic root of 28887787 is about 306.8349015209.

The spelling of 28887787 in words is "twenty-eight million, eight hundred eighty-seven thousand, seven hundred eighty-seven".