28200312 has 80 divisors (see below), whose sum is σ = 90285360. Its totient is φ = 8055936.

The previous prime is 28200287. The next prime is 28200349. The reversal of 28200312 is 21300282.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1428 + ... + 7644.

It is an arithmetic number, because the mean of its divisors is an integer number (1128567).

Almost surely, 2^28200312 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 28200312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45142680).

28200312 is an abundant number, since it is smaller than the sum of its proper divisors (62085048).

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

28200312 is a wasteful number, since it uses less digits than its factorization.

28200312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6242 (or 6229 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 28200312 is about 5310.3965953590. The cubic root of 28200312 is about 304.3813024709.

Adding to 28200312 its reverse (21300282), we get a palindrome (49500594).

The spelling of 28200312 in words is "twenty-eight million, two hundred thousand, three hundred twelve".