28536816881 has 8 divisors (see below), whose sum is σ = 28762884864. Its totient is φ = 28311406240.

The previous prime is 28536816859. The next prime is 28536816883. The reversal of 28536816881 is 18861863582.

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 28536816881 - 2¹⁸ = 28536554737 is a prime.

It is a super-2 number, since 2×28536816881² (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 (28536816883) 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, 76985 + ... + 250998.

It is an arithmetic number, because the mean of its divisors is an integer number (3595360608).

Almost surely, 2^28536816881 is an apocalyptic number.

It is an amenable number.

28536816881 is a deficient number, since it is larger than the sum of its proper divisors (226067983).

28536816881 is a wasteful number, since it uses less digits than its factorization.

28536816881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328671.

The product of its digits is 4423680, while the sum is 56.

The spelling of 28536816881 in words is "twenty-eight billion, five hundred thirty-six million, eight hundred sixteen thousand, eight hundred eighty-one".