28308636 has 48 divisors (see below), whose sum is σ = 74613280. Its totient is φ = 9279360.

The previous prime is 28308629. The next prime is 28308649. The reversal of 28308636 is 63680382.

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 28308636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4440 + ... + 8736.

Almost surely, 2^28308636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28308636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37306640).

28308636 is an abundant number, since it is smaller than the sum of its proper divisors (46304644).

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

28308636 is a wasteful number, since it uses less digits than its factorization.

28308636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4371 (or 4363 counting only the distinct ones).

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

The square root of 28308636 is about 5320.5860579451. The cubic root of 28308636 is about 304.7705377933.

The spelling of 28308636 in words is "twenty-eight million, three hundred eight thousand, six hundred thirty-six".