28084787 has 4 divisors (see below), whose sum is σ = 28105896. Its totient is φ = 28063680.

The previous prime is 28084769. The next prime is 28084801. The reversal of 28084787 is 78748082.

It is a happy number.

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 28084787 - 2⁶ = 28084723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28084087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8414 + ... + 11267.

It is an arithmetic number, because the mean of its divisors is an integer number (7026474).

Almost surely, 2^28084787 is an apocalyptic number.

28084787 is a deficient number, since it is larger than the sum of its proper divisors (21109).

28084787 is a wasteful number, since it uses less digits than its factorization.

28084787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21108.

The product of its (nonzero) digits is 200704, while the sum is 44.

The square root of 28084787 is about 5299.5081847281. The cubic root of 28084787 is about 303.9650922233.

The spelling of 28084787 in words is "twenty-eight million, eighty-four thousand, seven hundred eighty-seven".