28861721729327 has 2 divisors, whose sum is σ = 28861721729328. Its totient is φ = 28861721729326.

The previous prime is 28861721729257. The next prime is 28861721729363. The reversal of 28861721729327 is 72392712716882.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28861721729327 is a prime.

It is a super-2 number, since 2×28861721729327² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28861721725327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14430860864663 + 14430860864664.

It is an arithmetic number, because the mean of its divisors is an integer number (14430860864664).

Almost surely, 2^{28861721729327} is an apocalyptic number.

28861721729327 is a deficient number, since it is larger than the sum of its proper divisors (1).

28861721729327 is an equidigital number, since it uses as much as digits as its factorization.

28861721729327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56899584, while the sum is 65.

The spelling of 28861721729327 in words is "twenty-eight trillion, eight hundred sixty-one billion, seven hundred twenty-one million, seven hundred twenty-nine thousand, three hundred twenty-seven".