28918888 has 16 divisors (see below), whose sum is σ = 54320580. Its totient is φ = 14433408.

The previous prime is 28918873. The next prime is 28918891. The reversal of 28918888 is 88881982.

It can be written as a sum of positive squares in 2 ways, for example, as 28536964 + 381924 = 5342^2 + 618^2 .

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, 1956 + ... + 7852.

Almost surely, 2^28918888 is an apocalyptic number.

It is an amenable number.

28918888 is a deficient number, since it is larger than the sum of its proper divisors (25401692).

28918888 is a wasteful number, since it uses less digits than its factorization.

28918888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6516 (or 6512 counting only the distinct ones).

The product of its digits is 589824, while the sum is 52.

The square root of 28918888 is about 5377.6284735932. The cubic root of 28918888 is about 306.9449762924.

The spelling of 28918888 in words is "twenty-eight million, nine hundred eighteen thousand, eight hundred eighty-eight".