28354566081 has 8 divisors (see below), whose sum is σ = 37832476320. Its totient is φ = 18889849952.

The previous prime is 28354566073. The next prime is 28354566091. The reversal of 28354566081 is 18066545382.

It is a happy number.

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 28354566081 - 2³ = 28354566073 is a prime.

It is a super-2 number, since 2×28354566081² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28354566081.

It is not an unprimeable number, because it can be changed into a prime (28354566091) 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, 3293511 + ... + 3302108.

It is an arithmetic number, because the mean of its divisors is an integer number (4729059540).

Almost surely, 2^28354566081 is an apocalyptic number.

It is an amenable number.

28354566081 is a deficient number, since it is larger than the sum of its proper divisors (9477910239).

28354566081 is a wasteful number, since it uses less digits than its factorization.

28354566081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6597055.

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 28354566081 in words is "twenty-eight billion, three hundred fifty-four million, five hundred sixty-six thousand, eighty-one".