28530684 has 96 divisors (see below), whose sum is σ = 91069440. Its totient is φ = 7521984.

The previous prime is 28530683. The next prime is 28530701. The reversal of 28530684 is 48603582.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28530683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8377 + ... + 11279.

It is an arithmetic number, because the mean of its divisors is an integer number (948640).

Almost surely, 2^28530684 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 28530684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45534720).

28530684 is an abundant number, since it is smaller than the sum of its proper divisors (62538756).

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

28530684 is a wasteful number, since it uses less digits than its factorization.

28530684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936 (or 2928 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 28530684 is about 5341.4121728247. The cubic root of 28530684 is about 305.5653189950.

It can be divided in two parts, 285306 and 84, that added together give a triangular number (285390 = T₇₅₅).

The spelling of 28530684 in words is "twenty-eight million, five hundred thirty thousand, six hundred eighty-four".