28206686802681 has 32 divisors (see below), whose sum is σ = 44606571724800. Its totient is φ = 17563837571280.

The previous prime is 28206686802629. The next prime is 28206686802709. The reversal of 28206686802681 is 18620868660282.

It is not a de Polignac number, because 28206686802681 - 2³⁰ = 28205613060857 is a prime.

It is a super-2 number, since 2×28206686802681² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28206686803681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 387173401 + ... + 387246246.

It is an arithmetic number, because the mean of its divisors is an integer number (1393955366400).

Almost surely, 2^{28206686802681} is an apocalyptic number.

It is an amenable number.

28206686802681 is a deficient number, since it is larger than the sum of its proper divisors (16399884922119).

28206686802681 is a wasteful number, since it uses less digits than its factorization.

28206686802681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774419746 (or 774419740 counting only the distinct ones).

The product of its (nonzero) digits is 42467328, while the sum is 63.

The spelling of 28206686802681 in words is "twenty-eight trillion, two hundred six billion, six hundred eighty-six million, eight hundred two thousand, six hundred eighty-one".