28815312 has 20 divisors (see below), whose sum is σ = 74439680. Its totient is φ = 9605088.

The previous prime is 28815287. The next prime is 28815313. The reversal of 28815312 is 21351882.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28815312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28815313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300112 + ... + 300207.

It is an arithmetic number, because the mean of its divisors is an integer number (3721984).

Almost surely, 2^28815312 is an apocalyptic number.

It is an amenable number.

28815312 is an abundant number, since it is smaller than the sum of its proper divisors (45624368).

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

28815312 is a wasteful number, since it uses less digits than its factorization.

28815312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600330 (or 600324 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 28815312 is about 5367.9895677991. The cubic root of 28815312 is about 306.5780861573.

The spelling of 28815312 in words is "twenty-eight million, eight hundred fifteen thousand, three hundred twelve".