28878304 has 96 divisors (see below), whose sum is σ = 71801856. Its totient is φ = 11128320.

The previous prime is 28878301. The next prime is 28878313. The reversal of 28878304 is 40387882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28878301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136759 + ... + 136969.

It is an arithmetic number, because the mean of its divisors is an integer number (747936).

Almost surely, 2^28878304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28878304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35900928).

28878304 is an abundant number, since it is smaller than the sum of its proper divisors (42923552).

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

28878304 is a wasteful number, since it uses less digits than its factorization.

28878304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 28878304 is about 5373.8537382404. The cubic root of 28878304 is about 306.8013229268.

The spelling of 28878304 in words is "twenty-eight million, eight hundred seventy-eight thousand, three hundred four".