28287016231 has 2 divisors, whose sum is σ = 28287016232. Its totient is φ = 28287016230.

The previous prime is 28287016217. The next prime is 28287016259. The reversal of 28287016231 is 13261078282.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28287016231 - 2⁷ = 28287016103 is a prime.

It is a super-2 number, since 2×28287016231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28287016271) 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 as a sum of consecutive naturals, namely, 14143508115 + 14143508116.

It is an arithmetic number, because the mean of its divisors is an integer number (14143508116).

Almost surely, 2^28287016231 is an apocalyptic number.

28287016231 is a deficient number, since it is larger than the sum of its proper divisors (1).

28287016231 is an equidigital number, since it uses as much as digits as its factorization.

28287016231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 28287016231 in words is "twenty-eight billion, two hundred eighty-seven million, sixteen thousand, two hundred thirty-one".