28371636 has 36 divisors (see below), whose sum is σ = 75493600. Its totient is φ = 8959248.

The previous prime is 28371583. The next prime is 28371647. The reversal of 28371636 is 63617382.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28371636.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20056 + ... + 21423.

Almost surely, 2^28371636 is an apocalyptic number.

It is an amenable number.

28371636 is an abundant number, since it is smaller than the sum of its proper divisors (47121964).

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

28371636 is a wasteful number, since it uses less digits than its factorization.

28371636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41508 (or 41503 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 28371636 is about 5326.5031681207. The cubic root of 28371636 is about 304.9964561086.

The spelling of 28371636 in words is "twenty-eight million, three hundred seventy-one thousand, six hundred thirty-six".