28828878 has 32 divisors (see below), whose sum is σ = 62563200. Its totient is φ = 8803296.

The previous prime is 28828861. The next prime is 28828901. The reversal of 28828878 is 87882882.

It is a super-2 number, since 2×28828878² = 1662208413477768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28828878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9513 + ... + 12171.

It is an arithmetic number, because the mean of its divisors is an integer number (1955100).

Almost surely, 2^28828878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28828878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31281600).

28828878 is an abundant number, since it is smaller than the sum of its proper divisors (33734322).

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

28828878 is a wasteful number, since it uses less digits than its factorization.

28828878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816.

The product of its digits is 917504, while the sum is 51.

The square root of 28828878 is about 5369.2530206724. The cubic root of 28828878 is about 306.6261900474.

The spelling of 28828878 in words is "twenty-eight million, eight hundred twenty-eight thousand, eight hundred seventy-eight".