28071328 has 24 divisors (see below), whose sum is σ = 55671840. Its totient is φ = 13932480.

The previous prime is 28071319. The next prime is 28071349. The reversal of 28071328 is 82317082.

It is a self number, because there is not a number n which added to its sum of digits gives 28071328.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1293 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (2319660).

Almost surely, 2^28071328 is an apocalyptic number.

It is an amenable number.

28071328 is a deficient number, since it is larger than the sum of its proper divisors (27600512).

28071328 is a wasteful number, since it uses less digits than its factorization.

28071328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6460 (or 6452 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 28071328 is about 5298.2381977408. The cubic root of 28071328 is about 303.9165283292.

The spelling of 28071328 in words is "twenty-eight million, seventy-one thousand, three hundred twenty-eight".