28156044017 has 2 divisors, whose sum is σ = 28156044018. Its totient is φ = 28156044016.

The previous prime is 28156043999. The next prime is 28156044023. The reversal of 28156044017 is 71044065182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15032966881 + 13123077136 = 122609^2 + 114556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28156044017 is a prime.

It is not a weakly prime, because it can be changed into another prime (28156044047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14078022008 + 14078022009.

It is an arithmetic number, because the mean of its divisors is an integer number (14078022009).

Almost surely, 2^28156044017 is an apocalyptic number.

It is an amenable number.

28156044017 is a deficient number, since it is larger than the sum of its proper divisors (1).

28156044017 is an equidigital number, since it uses as much as digits as its factorization.

28156044017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 28156044017 in words is "twenty-eight billion, one hundred fifty-six million, forty-four thousand, seventeen".