28708491217727 has 4 divisors (see below), whose sum is σ = 28709104602096. Its totient is φ = 28707877833360.

The previous prime is 28708491217669. The next prime is 28708491217733. The reversal of 28708491217727 is 72771219480782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28708491217727 - 2¹² = 28708491213631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28708491217927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306621974 + ... + 306715587.

It is an arithmetic number, because the mean of its divisors is an integer number (7177276150524).

Almost surely, 2^{28708491217727} is an apocalyptic number.

28708491217727 is a deficient number, since it is larger than the sum of its proper divisors (613384369).

28708491217727 is an equidigital number, since it uses as much as digits as its factorization.

28708491217727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613384368.

The product of its (nonzero) digits is 44255232, while the sum is 65.

The spelling of 28708491217727 in words is "twenty-eight trillion, seven hundred eight billion, four hundred ninety-one million, two hundred seventeen thousand, seven hundred twenty-seven".