28057731173 has 2 divisors, whose sum is σ = 28057731174. Its totient is φ = 28057731172.

The previous prime is 28057731133. The next prime is 28057731197. The reversal of 28057731173 is 37113775082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27814901284 + 242829889 = 166778^2 + 15583^2 .

It is a cyclic number.

It is not a de Polignac number, because 28057731173 - 2⁸ = 28057730917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28057731103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028865586 + 14028865587.

It is an arithmetic number, because the mean of its divisors is an integer number (14028865587).

Almost surely, 2^28057731173 is an apocalyptic number.

It is an amenable number.

28057731173 is a deficient number, since it is larger than the sum of its proper divisors (1).

28057731173 is an equidigital number, since it uses as much as digits as its factorization.

28057731173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 28057731173 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty-one thousand, one hundred seventy-three".