28728084 has 48 divisors (see below), whose sum is σ = 83575296. Its totient is φ = 7461600.

The previous prime is 28728083. The next prime is 28728097. The reversal of 28728084 is 48082782.

It is a super-2 number, since 2×28728084² = 1650605620622112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28728083) 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 15 ways as a sum of consecutive naturals, for example, 14622 + ... + 16469.

It is an arithmetic number, because the mean of its divisors is an integer number (1741152).

Almost surely, 2^28728084 is an apocalyptic number.

It is an amenable number.

28728084 is an abundant number, since it is smaller than the sum of its proper divisors (54847212).

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

28728084 is a wasteful number, since it uses less digits than its factorization.

28728084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31116 (or 31114 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 28728084 is about 5359.8585802239. The cubic root of 28728084 is about 306.2684218267.

The spelling of 28728084 in words is "twenty-eight million, seven hundred twenty-eight thousand, eighty-four".