28530216 has 192 divisors, whose sum is σ = 96707520. Its totient is φ = 7464960.

The previous prime is 28530193. The next prime is 28530221. The reversal of 28530216 is 61203582.

It is a self number, because there is not a number n which added to its sum of digits gives 28530216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 174951 + ... + 175113.

It is an arithmetic number, because the mean of its divisors is an integer number (503685).

Almost surely, 2^28530216 is an apocalyptic number.

28530216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28530216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48353760).

28530216 is an abundant number, since it is smaller than the sum of its proper divisors (68177304).

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

28530216 is a wasteful number, since it uses less digits than its factorization.

28530216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28530216 is about 5341.3683640056. The cubic root of 28530216 is about 305.5636482166.

Adding to 28530216 its reverse (61203582), we get a palindrome (89733798).

The spelling of 28530216 in words is "twenty-eight million, five hundred thirty thousand, two hundred sixteen".