28062721793 has 2 divisors, whose sum is σ = 28062721794. Its totient is φ = 28062721792.

The previous prime is 28062721787. The next prime is 28062721829. The reversal of 28062721793 is 39712726082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26094202369 + 1968519424 = 161537^2 + 44368^2 .

It is a cyclic number.

It is not a de Polignac number, because 28062721793 - 2¹⁰ = 28062720769 is a prime.

It is not a weakly prime, because it can be changed into another prime (28052721793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14031360896 + 14031360897.

It is an arithmetic number, because the mean of its divisors is an integer number (14031360897).

Almost surely, 2^28062721793 is an apocalyptic number.

It is an amenable number.

28062721793 is a deficient number, since it is larger than the sum of its proper divisors (1).

28062721793 is an equidigital number, since it uses as much as digits as its factorization.

28062721793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 28062721793 in words is "twenty-eight billion, sixty-two million, seven hundred twenty-one thousand, seven hundred ninety-three".