28728912 has 120 divisors (see below), whose sum is σ = 83749600. Its totient is φ = 8460288.

The previous prime is 28728911. The next prime is 28728919. The reversal of 28728912 is 21982782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28728911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 263514 + ... + 263622.

Almost surely, 2^28728912 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 28728912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41874800).

28728912 is an abundant number, since it is smaller than the sum of its proper divisors (55020688).

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

28728912 is a wasteful number, since it uses less digits than its factorization.

28728912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 150 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 28728912 is about 5359.9358205113. The cubic root of 28728912 is about 306.2713642183.

The spelling of 28728912 in words is "twenty-eight million, seven hundred twenty-eight thousand, nine hundred twelve".