28878404 has 12 divisors (see below), whose sum is σ = 53197200. Its totient is φ = 13679208.

The previous prime is 28878401. The next prime is 28878433. The reversal of 28878404 is 40487882.

It is not an unprimeable number, because it can be changed into a prime (28878401) 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 3 ways as a sum of consecutive naturals, for example, 189914 + ... + 190065.

It is an arithmetic number, because the mean of its divisors is an integer number (4433100).

Almost surely, 2^28878404 is an apocalyptic number.

It is an amenable number.

28878404 is a deficient number, since it is larger than the sum of its proper divisors (24318796).

28878404 is a wasteful number, since it uses less digits than its factorization.

28878404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380002 (or 380000 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 41.

The square root of 28878404 is about 5373.8630425421. The cubic root of 28878404 is about 306.8016770577.

The spelling of 28878404 in words is "twenty-eight million, eight hundred seventy-eight thousand, four hundred four".