28140306847 has 4 divisors (see below), whose sum is σ = 28456490160. Its totient is φ = 27824123536.

The previous prime is 28140306781. The next prime is 28140306853. The reversal of 28140306847 is 74860304182.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28140306847 is a prime.

It is a super-3 number, since 3×28140306847³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28140306247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158091523 + ... + 158091700.

It is an arithmetic number, because the mean of its divisors is an integer number (7114122540).

Almost surely, 2^28140306847 is an apocalyptic number.

28140306847 is a deficient number, since it is larger than the sum of its proper divisors (316183313).

28140306847 is an equidigital number, since it uses as much as digits as its factorization.

28140306847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316183312.

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 28140306847 in words is "twenty-eight billion, one hundred forty million, three hundred six thousand, eight hundred forty-seven".