28855138 has 8 divisors (see below), whose sum is σ = 46612188. Its totient is φ = 13317744.

The previous prime is 28855111. The next prime is 28855139. The reversal of 28855138 is 83155882.

It can be written as a sum of positive squares in 2 ways, for example, as 27594009 + 1261129 = 5253^2 + 1123^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28855138.

It is not an unprimeable number, because it can be changed into a prime (28855139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554881 + ... + 554932.

Almost surely, 2^28855138 is an apocalyptic number.

28855138 is a deficient number, since it is larger than the sum of its proper divisors (17757050).

28855138 is a wasteful number, since it uses less digits than its factorization.

28855138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109828.

The product of its digits is 76800, while the sum is 40.

The square root of 28855138 is about 5371.6978693892. The cubic root of 28855138 is about 306.7192629279.

The spelling of 28855138 in words is "twenty-eight million, eight hundred fifty-five thousand, one hundred thirty-eight".