28006328 has 16 divisors (see below), whose sum is σ = 60013680. Its totient is φ = 12002688.

The previous prime is 28006309. The next prime is 28006333. The reversal of 28006328 is 82360082.

It is a self number, because there is not a number n which added to its sum of digits gives 28006328.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250001 + ... + 250112.

It is an arithmetic number, because the mean of its divisors is an integer number (3750855).

Almost surely, 2^28006328 is an apocalyptic number.

28006328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28006328 is an abundant number, since it is smaller than the sum of its proper divisors (32007352).

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

28006328 is a wasteful number, since it uses less digits than its factorization.

28006328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500126 (or 500122 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28006328 is about 5292.1005281457. The cubic root of 28006328 is about 303.6817711014.

The spelling of 28006328 in words is "twenty-eight million, six thousand, three hundred twenty-eight".