28578138 has 16 divisors (see below), whose sum is σ = 57508896. Its totient is φ = 9467280.

The previous prime is 28578133. The next prime is 28578161. The reversal of 28578138 is 83187582.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28578138.

It is not an unprimeable number, because it can be changed into a prime (28578131) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13633 + ... + 15588.

It is an arithmetic number, because the mean of its divisors is an integer number (3594306).

Almost surely, 2^28578138 is an apocalyptic number.

28578138 is an abundant number, since it is smaller than the sum of its proper divisors (28930758).

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

28578138 is a wasteful number, since it uses less digits than its factorization.

28578138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29389.

The product of its digits is 107520, while the sum is 42.

The square root of 28578138 is about 5345.8524109818. The cubic root of 28578138 is about 305.7346368752.

The spelling of 28578138 in words is "twenty-eight million, five hundred seventy-eight thousand, one hundred thirty-eight".