28835728 has 40 divisors (see below), whose sum is σ = 58315712. Its totient is φ = 13799808.

The previous prime is 28835717. The next prime is 28835743. The reversal of 28835728 is 82753882.

28835728 = T₄₃₂ + T₄₃₃ + ... + T₆₃₂.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39301 + ... + 40027.

Almost surely, 2^28835728 is an apocalyptic number.

It is an amenable number.

28835728 is an abundant number, since it is smaller than the sum of its proper divisors (29479984).

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

28835728 is a wasteful number, since it uses less digits than its factorization.

28835728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839 (or 833 counting only the distinct ones).

The product of its digits is 215040, while the sum is 43.

The square root of 28835728 is about 5369.8908741240. The cubic root of 28835728 is about 306.6504738352.

The spelling of 28835728 in words is "twenty-eight million, eight hundred thirty-five thousand, seven hundred twenty-eight".