28636641 has 24 divisors (see below), whose sum is σ = 45470880. Its totient is φ = 17222400.

The previous prime is 28636639. The next prime is 28636649. The reversal of 28636641 is 14663682.

28636641 is a `hidden beast` number, since 2 + 8 + 6 + 3 + 6 + 641 = 666.

It is not a de Polignac number, because 28636641 - 2¹ = 28636639 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28636596 and 28636605.

It is not an unprimeable number, because it can be changed into a prime (28636649) 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, 12721 + ... + 14801.

It is an arithmetic number, because the mean of its divisors is an integer number (1894620).

Almost surely, 2^28636641 is an apocalyptic number.

It is an amenable number.

28636641 is a deficient number, since it is larger than the sum of its proper divisors (16834239).

28636641 is a wasteful number, since it uses less digits than its factorization.

28636641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237 (or 2234 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 28636641 is about 5351.3214255920. The cubic root of 28636641 is about 305.9431202749.

The spelling of 28636641 in words is "twenty-eight million, six hundred thirty-six thousand, six hundred forty-one".