28788938 has 16 divisors (see below), whose sum is σ = 45308160. Its totient is φ = 13700400.

The previous prime is 28788913. The next prime is 28788979. The reversal of 28788938 is 83988782.

It is a self number, because there is not a number n which added to its sum of digits gives 28788938.

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 7 ways as a sum of consecutive naturals, for example, 623 + ... + 7613.

It is an arithmetic number, because the mean of its divisors is an integer number (2831760).

Almost surely, 2^28788938 is an apocalyptic number.

28788938 is a deficient number, since it is larger than the sum of its proper divisors (16519222).

28788938 is a wasteful number, since it uses less digits than its factorization.

28788938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7093.

The product of its digits is 1548288, while the sum is 53.

The square root of 28788938 is about 5365.5324060153. The cubic root of 28788938 is about 306.4845229551.

The spelling of 28788938 in words is "twenty-eight million, seven hundred eighty-eight thousand, nine hundred thirty-eight".