28506787 has 4 divisors (see below), whose sum is σ = 28517616. Its totient is φ = 28495960.

The previous prime is 28506781. The next prime is 28506791. The reversal of 28506787 is 78760582.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28506787 - 2¹¹ = 28504739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28506781) 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, 1362 + ... + 7672.

It is an arithmetic number, because the mean of its divisors is an integer number (7129404).

Almost surely, 2^28506787 is an apocalyptic number.

28506787 is a deficient number, since it is larger than the sum of its proper divisors (10829).

28506787 is an equidigital number, since it uses as much as digits as its factorization.

28506787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10828.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 28506787 is about 5339.1747489664. The cubic root of 28506787 is about 305.4799824021.

The spelling of 28506787 in words is "twenty-eight million, five hundred six thousand, seven hundred eighty-seven".