28715312 has 40 divisors (see below), whose sum is σ = 59322096. Its totient is φ = 13418496.

The previous prime is 28715299. The next prime is 28715317. The reversal of 28715312 is 21351782.

28715312 is nontrivially palindromic in base 3.

It is not an unprimeable number, because it can be changed into a prime (28715317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52223 + ... + 52769.

Almost surely, 2^28715312 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 28715312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29661048).

28715312 is an abundant number, since it is smaller than the sum of its proper divisors (30606784).

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

28715312 is a wasteful number, since it uses less digits than its factorization.

28715312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765 (or 759 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 28715312 is about 5358.6669984241. Note that the first 3 decimals coincide. The cubic root of 28715312 is about 306.2230279175.

The spelling of 28715312 in words is "twenty-eight million, seven hundred fifteen thousand, three hundred twelve".