28762728 has 16 divisors (see below), whose sum is σ = 71906880. Its totient is φ = 9587568.

The previous prime is 28762711. The next prime is 28762733. The reversal of 28762728 is 82726782.

It is a self number, because there is not a number n which added to its sum of digits gives 28762728.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 599200 + ... + 599247.

It is an arithmetic number, because the mean of its divisors is an integer number (4494180).

Almost surely, 2^28762728 is an apocalyptic number.

It is an amenable number.

28762728 is an abundant number, since it is smaller than the sum of its proper divisors (43144152).

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

28762728 is a wasteful number, since it uses less digits than its factorization.

28762728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198456 (or 1198452 counting only the distinct ones).

The product of its digits is 150528, while the sum is 42.

The square root of 28762728 is about 5363.0894081676. The cubic root of 28762728 is about 306.3914849236.

The spelling of 28762728 in words is "twenty-eight million, seven hundred sixty-two thousand, seven hundred twenty-eight".