28708324285521 has 8 divisors (see below), whose sum is σ = 38446390233504. Its totient is φ = 19054570597280.

The previous prime is 28708324285517. The next prime is 28708324285633. The reversal of 28708324285521 is 12558242380782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28708324285521 - 2² = 28708324285517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28708324215521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21078064140 + ... + 21078065501.

It is an arithmetic number, because the mean of its divisors is an integer number (4805798779188).

Almost surely, 2^{28708324285521} is an apocalyptic number.

It is an amenable number.

28708324285521 is a deficient number, since it is larger than the sum of its proper divisors (9738065947983).

28708324285521 is a wasteful number, since it uses less digits than its factorization.

28708324285521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42156129871.

The product of its (nonzero) digits is 17203200, while the sum is 57.

The spelling of 28708324285521 in words is "twenty-eight trillion, seven hundred eight billion, three hundred twenty-four million, two hundred eighty-five thousand, five hundred twenty-one".