28771920061873 has 2 divisors, whose sum is σ = 28771920061874. Its totient is φ = 28771920061872.

The previous prime is 28771920061867. The next prime is 28771920061877. The reversal of 28771920061873 is 37816002917782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17153413822224 + 11618506239649 = 4141668^2 + 3408593^2 .

It is a cyclic number.

It is not a de Polignac number, because 28771920061873 - 2²¹ = 28771917964721 is a prime.

It is a super-2 number, since 2×28771920061873² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28771920061877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14385960030936 + 14385960030937.

It is an arithmetic number, because the mean of its divisors is an integer number (14385960030937).

Almost surely, 2^{28771920061873} is an apocalyptic number.

It is an amenable number.

28771920061873 is a deficient number, since it is larger than the sum of its proper divisors (1).

28771920061873 is an equidigital number, since it uses as much as digits as its factorization.

28771920061873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14224896, while the sum is 61.

The spelling of 28771920061873 in words is "twenty-eight trillion, seven hundred seventy-one billion, nine hundred twenty million, sixty-one thousand, eight hundred seventy-three".