28081646615 has 8 divisors (see below), whose sum is σ = 36761428368. Its totient is φ = 20423015680.

The previous prime is 28081646557. The next prime is 28081646627. The reversal of 28081646615 is 51664618082.

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

It is not a de Polignac number, because 28081646615 - 2¹⁴ = 28081630231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28081646615.

It is a congruent number.

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, 255287642 + ... + 255287751.

It is an arithmetic number, because the mean of its divisors is an integer number (4595178546).

Almost surely, 2^28081646615 is an apocalyptic number.

28081646615 is a deficient number, since it is larger than the sum of its proper divisors (8679781753).

28081646615 is a wasteful number, since it uses less digits than its factorization.

28081646615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510575409.

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 28081646615 in words is "twenty-eight billion, eighty-one million, six hundred forty-six thousand, six hundred fifteen".