28211316 has 96 divisors (see below), whose sum is σ = 80183040. Its totient is φ = 7547904.

The previous prime is 28211303. The next prime is 28211377. The reversal of 28211316 is 61311282.

28211316 is a nontrivial binomial coefficient, being equal to C(7512, 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89976 + ... + 90288.

It is an arithmetic number, because the mean of its divisors is an integer number (835240).

Almost surely, 2^28211316 is an apocalyptic number.

28211316 is the 7511-st triangular number and also the 3756-th hexagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28211316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40091520).

28211316 is an abundant number, since it is smaller than the sum of its proper divisors (51971724).

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

28211316 is a wasteful number, since it uses less digits than its factorization.

28211316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 391 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 28211316 is about 5311.4325751157. The cubic root of 28211316 is about 304.4208880411.

Adding to 28211316 its reverse (61311282), we get a palindrome (89522598).

The spelling of 28211316 in words is "twenty-eight million, two hundred eleven thousand, three hundred sixteen".