28131786036 has 72 divisors (see below), whose sum is σ = 75219318720. Its totient is φ = 8846665344.

The previous prime is 28131786019. The next prime is 28131786037. The reversal of 28131786036 is 63068713182.

28131786036 is a `hidden beast` number, since 2 + 8 + 1 + 31 + 7 + 8 + 603 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 28131785982 and 28131786000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28131786037) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172266 + ... + 293153.

It is an arithmetic number, because the mean of its divisors is an integer number (1044712760).

Almost surely, 2^28131786036 is an apocalyptic number.

It is an amenable number.

28131786036 is an abundant number, since it is smaller than the sum of its proper divisors (47087532684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28131786036 is a wasteful number, since it uses less digits than its factorization.

28131786036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465525 (or 465520 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 28131786036 in words is "twenty-eight billion, one hundred thirty-one million, seven hundred eighty-six thousand, thirty-six".