28546139191 has 4 divisors (see below), whose sum is σ = 28583849512. Its totient is φ = 28508428872.

The previous prime is 28546139189. The next prime is 28546139221. The reversal of 28546139191 is 19193164582.

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 28546139191 - 2¹ = 28546139189 is a prime.

It is a super-2 number, since 2×28546139191² (a number of 22 digits) contains 22 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 (28546139491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18854025 + ... + 18855538.

It is an arithmetic number, because the mean of its divisors is an integer number (7145962378).

Almost surely, 2^28546139191 is an apocalyptic number.

28546139191 is a deficient number, since it is larger than the sum of its proper divisors (37710321).

28546139191 is an equidigital number, since it uses as much as digits as its factorization.

28546139191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37710320.

The product of its digits is 466560, while the sum is 49.

The spelling of 28546139191 in words is "twenty-eight billion, five hundred forty-six million, one hundred thirty-nine thousand, one hundred ninety-one".