28856787 has 8 divisors (see below), whose sum is σ = 38565120. Its totient is φ = 19193160.

The previous prime is 28856783. The next prime is 28856797. The reversal of 28856787 is 78765882.

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

It is not a de Polignac number, because 28856787 - 2² = 28856783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28856783) 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 7 ways as a sum of consecutive naturals, for example, 9639 + ... + 12272.

It is an arithmetic number, because the mean of its divisors is an integer number (4820640).

Almost surely, 2^28856787 is an apocalyptic number.

28856787 is a deficient number, since it is larger than the sum of its proper divisors (9708333).

28856787 is a wasteful number, since it uses less digits than its factorization.

28856787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22353.

The product of its digits is 1505280, while the sum is 51.

The square root of 28856787 is about 5371.8513568415. The cubic root of 28856787 is about 306.7251055665.

It can be divided in two parts, 288 and 56787, that added together give a palindrome (57075).

The spelling of 28856787 in words is "twenty-eight million, eight hundred fifty-six thousand, seven hundred eighty-seven".