28155312 has 60 divisors (see below), whose sum is σ = 82231344. Its totient is φ = 8976000.

The previous prime is 28155299. The next prime is 28155319. The reversal of 28155312 is 21355182.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28155319) 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, 939 + ... + 7562.

Almost surely, 2^28155312 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 28155312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41115672).

28155312 is an abundant number, since it is smaller than the sum of its proper divisors (54076032).

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

28155312 is a wasteful number, since it uses less digits than its factorization.

28155312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8538 (or 8529 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 28155312 is about 5306.1579320635. The cubic root of 28155312 is about 304.2193131199.

The spelling of 28155312 in words is "twenty-eight million, one hundred fifty-five thousand, three hundred twelve".