28784189127 has 4 divisors (see below), whose sum is σ = 38378918840. Its totient is φ = 19189459416.

The previous prime is 28784189117. The next prime is 28784189143. The reversal of 28784189127 is 72198148782.

It is a happy number.

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

It is not a de Polignac number, because 28784189127 - 2⁷ = 28784188999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28784189107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4797364852 + ... + 4797364857.

It is an arithmetic number, because the mean of its divisors is an integer number (9594729710).

Almost surely, 2^28784189127 is an apocalyptic number.

28784189127 is a deficient number, since it is larger than the sum of its proper divisors (9594729713).

28784189127 is an equidigital number, since it uses as much as digits as its factorization.

28784189127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9594729712.

The product of its digits is 3612672, while the sum is 57.

The spelling of 28784189127 in words is "twenty-eight billion, seven hundred eighty-four million, one hundred eighty-nine thousand, one hundred twenty-seven".