28728012 has 24 divisors (see below), whose sum is σ = 69947136. Its totient is φ = 9159568.

The previous prime is 28728001. The next prime is 28728013. The reversal of 28728012 is 21082782.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (28728013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51768 + ... + 52319.

It is an arithmetic number, because the mean of its divisors is an integer number (2914464).

Almost surely, 2^28728012 is an apocalyptic number.

It is an amenable number.

28728012 is an abundant number, since it is smaller than the sum of its proper divisors (41219124).

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

28728012 is a wasteful number, since it uses less digits than its factorization.

28728012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104117 (or 104115 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28728012 is about 5359.8518636246. The cubic root of 28728012 is about 306.2681659639.

The spelling of 28728012 in words is "twenty-eight million, seven hundred twenty-eight thousand, twelve".