28307112 has 64 divisors (see below), whose sum is σ = 77760000. Its totient is φ = 8547264.

The previous prime is 28307107. The next prime is 28307119. The reversal of 28307112 is 21170382.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (28307119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9139 + ... + 11837.

It is an arithmetic number, because the mean of its divisors is an integer number (1215000).

Almost surely, 2^28307112 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 28307112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38880000).

28307112 is an abundant number, since it is smaller than the sum of its proper divisors (49452888).

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

28307112 is a wasteful number, since it uses less digits than its factorization.

28307112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2750 (or 2746 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 28307112 is about 5320.4428387118. The cubic root of 28307112 is about 304.7650685714.

Adding to 28307112 its reverse (21170382), we get a palindrome (49477494).

The spelling of 28307112 in words is "twenty-eight million, three hundred seven thousand, one hundred twelve".