28660236 has 48 divisors (see below), whose sum is σ = 75479040. Its totient is φ = 8384320.

The previous prime is 28660223. The next prime is 28660241. The reversal of 28660236 is 63206682.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 28660197 and 28660206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85 + ... + 7571.

It is an arithmetic number, because the mean of its divisors is an integer number (1572480).

Almost surely, 2^28660236 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 28660236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37739520).

28660236 is an abundant number, since it is smaller than the sum of its proper divisors (46818804).

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

28660236 is a wasteful number, since it uses less digits than its factorization.

28660236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7534 (or 7532 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 28660236 is about 5353.5255673248. The cubic root of 28660236 is about 306.0271239146.

The spelling of 28660236 in words is "twenty-eight million, six hundred sixty thousand, two hundred thirty-six".