28181406236 has 96 divisors (see below), whose sum is σ = 54238464000. Its totient is φ = 12772767744.

The previous prime is 28181406229. The next prime is 28181406247. The reversal of 28181406236 is 63260418182.

It is a junction number, because it is equal to n+sod(n) for n = 28181406193 and 28181406202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56475515 + ... + 56476013.

It is an arithmetic number, because the mean of its divisors is an integer number (564984000).

Almost surely, 2^28181406236 is an apocalyptic number.

It is an amenable number.

28181406236 is a deficient number, since it is larger than the sum of its proper divisors (26057057764).

28181406236 is a wasteful number, since it uses less digits than its factorization.

28181406236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963 (or 961 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 28181406236 in words is "twenty-eight billion, one hundred eighty-one million, four hundred six thousand, two hundred thirty-six".