28878432 has 192 divisors, whose sum is σ = 91445760. Its totient is φ = 7884800.

The previous prime is 28878401. The next prime is 28878433. The reversal of 28878432 is 23487882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28878433) 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 31 ways as a sum of consecutive naturals, for example, 704332 + ... + 704372.

It is an arithmetic number, because the mean of its divisors is an integer number (476280).

Almost surely, 2^28878432 is an apocalyptic number.

28878432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28878432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45722880).

28878432 is an abundant number, since it is smaller than the sum of its proper divisors (62567328).

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

28878432 is a wasteful number, since it uses less digits than its factorization.

28878432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 109 counting only the distinct ones).

The product of its digits is 172032, while the sum is 42.

The square root of 28878432 is about 5373.8656477437. The cubic root of 28878432 is about 306.8017762142.

The spelling of 28878432 in words is "twenty-eight million, eight hundred seventy-eight thousand, four hundred thirty-two".