28647612881 has 8 divisors (see below), whose sum is σ = 30156945600. Its totient is φ = 27138436560.

The previous prime is 28647612853. The next prime is 28647612887. The reversal of 28647612881 is 18821674682.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28647612881 is a prime.

It is a super-2 number, since 2×28647612881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28647612887) by changing a digit.

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, 635396 + ... + 678986.

It is an arithmetic number, because the mean of its divisors is an integer number (3769618200).

Almost surely, 2^28647612881 is an apocalyptic number.

It is an amenable number.

28647612881 is a deficient number, since it is larger than the sum of its proper divisors (1509332719).

28647612881 is a wasteful number, since it uses less digits than its factorization.

28647612881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78199.

The product of its digits is 2064384, while the sum is 53.

The spelling of 28647612881 in words is "twenty-eight billion, six hundred forty-seven million, six hundred twelve thousand, eight hundred eighty-one".