28321751057 has 2 divisors, whose sum is σ = 28321751058. Its totient is φ = 28321751056.

The previous prime is 28321751053. The next prime is 28321751099. The reversal of 28321751057 is 75015712382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19885512256 + 8436238801 = 141016^2 + 91849^2 .

It is a cyclic number.

It is not a de Polignac number, because 28321751057 - 2² = 28321751053 is a prime.

It is not a weakly prime, because it can be changed into another prime (28321751053) 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, 14160875528 + 14160875529.

It is an arithmetic number, because the mean of its divisors is an integer number (14160875529).

Almost surely, 2^28321751057 is an apocalyptic number.

It is an amenable number.

28321751057 is a deficient number, since it is larger than the sum of its proper divisors (1).

28321751057 is an equidigital number, since it uses as much as digits as its factorization.

28321751057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117600, while the sum is 41.

The spelling of 28321751057 in words is "twenty-eight billion, three hundred twenty-one million, seven hundred fifty-one thousand, fifty-seven".