28534431641 has 2 divisors, whose sum is σ = 28534431642. Its totient is φ = 28534431640.

The previous prime is 28534431637. The next prime is 28534431661. The reversal of 28534431641 is 14613443582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27284102041 + 1250329600 = 165179^2 + 35360^2 .

It is a cyclic number.

It is not a de Polignac number, because 28534431641 - 2² = 28534431637 is a prime.

It is not a weakly prime, because it can be changed into another prime (28534431661) 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 as a sum of consecutive naturals, namely, 14267215820 + 14267215821.

It is an arithmetic number, because the mean of its divisors is an integer number (14267215821).

Almost surely, 2^28534431641 is an apocalyptic number.

It is an amenable number.

28534431641 is a deficient number, since it is larger than the sum of its proper divisors (1).

28534431641 is an equidigital number, since it uses as much as digits as its factorization.

28534431641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 41.

The spelling of 28534431641 in words is "twenty-eight billion, five hundred thirty-four million, four hundred thirty-one thousand, six hundred forty-one".