28123528957 has 2 divisors, whose sum is σ = 28123528958. Its totient is φ = 28123528956.

The previous prime is 28123528919. The next prime is 28123528963. The reversal of 28123528957 is 75982532182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22080176836 + 6043352121 = 148594^2 + 77739^2 .

It is a cyclic number.

It is not a de Polignac number, because 28123528957 - 2¹¹ = 28123526909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28123528907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14061764478 + 14061764479.

It is an arithmetic number, because the mean of its divisors is an integer number (14061764479).

Almost surely, 2^28123528957 is an apocalyptic number.

It is an amenable number.

28123528957 is a deficient number, since it is larger than the sum of its proper divisors (1).

28123528957 is an equidigital number, since it uses as much as digits as its factorization.

28123528957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 52.

The spelling of 28123528957 in words is "twenty-eight billion, one hundred twenty-three million, five hundred twenty-eight thousand, nine hundred fifty-seven".