28056272521 has 2 divisors, whose sum is σ = 28056272522. Its totient is φ = 28056272520.

The previous prime is 28056272509. The next prime is 28056272557. The reversal of 28056272521 is 12527265082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28022760000 + 33512521 = 167400^2 + 5789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28056272521 is a prime.

It is not a weakly prime, because it can be changed into another prime (28056272591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028136260 + 14028136261.

It is an arithmetic number, because the mean of its divisors is an integer number (14028136261).

Almost surely, 2^28056272521 is an apocalyptic number.

It is an amenable number.

28056272521 is a deficient number, since it is larger than the sum of its proper divisors (1).

28056272521 is an equidigital number, since it uses as much as digits as its factorization.

28056272521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 28056272521 in words is "twenty-eight billion, fifty-six million, two hundred seventy-two thousand, five hundred twenty-one".