28731312 has 30 divisors (see below), whose sum is σ = 80408172. Its totient is φ = 9577056.

The previous prime is 28731299. The next prime is 28731317. The reversal of 28731312 is 21313782.

It is not an unprimeable number, because it can be changed into a prime (28731317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99618 + ... + 99905.

Almost surely, 2^28731312 is an apocalyptic number.

It is an amenable number.

28731312 is an abundant number, since it is smaller than the sum of its proper divisors (51676860).

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

28731312 is a wasteful number, since it uses less digits than its factorization.

28731312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199537 (or 199528 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 28731312 is about 5360.1596991135. The cubic root of 28731312 is about 306.2798925701.

The spelling of 28731312 in words is "twenty-eight million, seven hundred thirty-one thousand, three hundred twelve".