28018532491 has 2 divisors, whose sum is σ = 28018532492. Its totient is φ = 28018532490.

The previous prime is 28018532471. The next prime is 28018532501. The reversal of 28018532491 is 19423581082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28018532491 - 2⁵ = 28018532459 is a prime.

It is not a weakly prime, because it can be changed into another prime (28018532471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14009266245 + 14009266246.

It is an arithmetic number, because the mean of its divisors is an integer number (14009266246).

Almost surely, 2^28018532491 is an apocalyptic number.

28018532491 is a deficient number, since it is larger than the sum of its proper divisors (1).

28018532491 is an equidigital number, since it uses as much as digits as its factorization.

28018532491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 28018532491 in words is "twenty-eight billion, eighteen million, five hundred thirty-two thousand, four hundred ninety-one".