28178888057 has 2 divisors, whose sum is σ = 28178888058. Its totient is φ = 28178888056.

The previous prime is 28178888051. The next prime is 28178888071. The reversal of 28178888057 is 75088887182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24247472656 + 3931415401 = 155716^2 + 62701^2 .

It is a cyclic number.

It is not a de Polignac number, because 28178888057 - 2⁴ = 28178888041 is a prime.

It is not a weakly prime, because it can be changed into another prime (28178888051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14089444028 + 14089444029.

It is an arithmetic number, because the mean of its divisors is an integer number (14089444029).

Almost surely, 2^28178888057 is an apocalyptic number.

It is an amenable number.

28178888057 is a deficient number, since it is larger than the sum of its proper divisors (1).

28178888057 is an equidigital number, since it uses as much as digits as its factorization.

28178888057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16056320, while the sum is 62.

The spelling of 28178888057 in words is "twenty-eight billion, one hundred seventy-eight million, eight hundred eighty-eight thousand, fifty-seven".