28075538 has 8 divisors (see below), whose sum is σ = 43565580. Its totient is φ = 13553680.

The previous prime is 28075519. The next prime is 28075543. The reversal of 28075538 is 83557082.

It can be written as a sum of positive squares in 2 ways, for example, as 26759929 + 1315609 = 5173^2 + 1147^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 241973 + ... + 242088.

Almost surely, 2^28075538 is an apocalyptic number.

28075538 is a deficient number, since it is larger than the sum of its proper divisors (15490042).

28075538 is a wasteful number, since it uses less digits than its factorization.

28075538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484092.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 28075538 is about 5298.6354847262. The cubic root of 28075538 is about 303.9317208728.

The spelling of 28075538 in words is "twenty-eight million, seventy-five thousand, five hundred thirty-eight".