28062721721 has 2 divisors, whose sum is σ = 28062721722. Its totient is φ = 28062721720.

The previous prime is 28062721699. The next prime is 28062721741. The reversal of 28062721721 is 12712726082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22548025600 + 5514696121 = 150160^2 + 74261^2 .

It is a cyclic number.

It is not a de Polignac number, because 28062721721 - 2⁶ = 28062721657 is a prime.

It is not a weakly prime, because it can be changed into another prime (28062721741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14031360860 + 14031360861.

It is an arithmetic number, because the mean of its divisors is an integer number (14031360861).

Almost surely, 2^28062721721 is an apocalyptic number.

It is an amenable number.

28062721721 is a deficient number, since it is larger than the sum of its proper divisors (1).

28062721721 is an equidigital number, since it uses as much as digits as its factorization.

28062721721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 38.

The spelling of 28062721721 in words is "twenty-eight billion, sixty-two million, seven hundred twenty-one thousand, seven hundred twenty-one".