28758056060821 has 2 divisors, whose sum is σ = 28758056060822. Its totient is φ = 28758056060820.

The previous prime is 28758056060791. The next prime is 28758056060827. The reversal of 28758056060821 is 12806065085782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27483166668721 + 1274889392100 = 5242439^2 + 1129110^2 .

It is a cyclic number.

It is not a de Polignac number, because 28758056060821 - 2⁷ = 28758056060693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28758056060827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14379028030410 + 14379028030411.

It is an arithmetic number, because the mean of its divisors is an integer number (14379028030411).

Almost surely, 2^{28758056060821} is an apocalyptic number.

It is an amenable number.

28758056060821 is a deficient number, since it is larger than the sum of its proper divisors (1).

28758056060821 is an equidigital number, since it uses as much as digits as its factorization.

28758056060821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12902400, while the sum is 58.

The spelling of 28758056060821 in words is "twenty-eight trillion, seven hundred fifty-eight billion, fifty-six million, sixty thousand, eight hundred twenty-one".