28947312 has 60 divisors (see below), whose sum is σ = 83005104. Its totient is φ = 9411840.

The previous prime is 28947293. The next prime is 28947313. The reversal of 28947312 is 21374982.

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 (28947313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3453 + ... + 8355.

Almost surely, 2^28947312 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 28947312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41502552).

28947312 is an abundant number, since it is smaller than the sum of its proper divisors (54057792).

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

28947312 is a wasteful number, since it uses less digits than its factorization.

28947312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4958 (or 4949 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 28947312 is about 5380.2706251638. The cubic root of 28947312 is about 307.0455074416.

The spelling of 28947312 in words is "twenty-eight million, nine hundred forty-seven thousand, three hundred twelve".