28215028565665 has 8 divisors (see below), whose sum is σ = 33868423385280. Its totient is φ = 22565096781552.

The previous prime is 28215028565621. The next prime is 28215028565743. The reversal of 28215028565665 is 56656582051282.

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 28215028565665 - 2¹⁹ = 28215028041377 is a prime.

It is a super-2 number, since 2×28215028565665² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865740949 + ... + 865773538.

It is an arithmetic number, because the mean of its divisors is an integer number (4233552923160).

Almost surely, 2^{28215028565665} is an apocalyptic number.

It is an amenable number.

28215028565665 is a deficient number, since it is larger than the sum of its proper divisors (5653394819615).

28215028565665 is a wasteful number, since it uses less digits than its factorization.

28215028565665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731517751.

The product of its (nonzero) digits is 69120000, while the sum is 61.

The spelling of 28215028565665 in words is "twenty-eight trillion, two hundred fifteen billion, twenty-eight million, five hundred sixty-five thousand, six hundred sixty-five".