28878120 has 96 divisors (see below), whose sum is σ = 97362720. Its totient is φ = 7698240.

The previous prime is 28878077. The next prime is 28878127. The reversal of 28878120 is 2187882.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28878127) 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 23 ways as a sum of consecutive naturals, for example, 8235 + ... + 11205.

It is an arithmetic number, because the mean of its divisors is an integer number (1014195).

Almost surely, 2^28878120 is an apocalyptic number.

28878120 is a gapful number since it is divisible by the number (20) 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 28878120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48681360).

28878120 is an abundant number, since it is smaller than the sum of its proper divisors (68484600).

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

28878120 is a wasteful number, since it uses less digits than its factorization.

28878120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2997 (or 2981 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28878120 is about 5373.8366182831. The cubic root of 28878120 is about 306.8006713239.

The spelling of 28878120 in words is "twenty-eight million, eight hundred seventy-eight thousand, one hundred twenty".