28128858 has 8 divisors (see below), whose sum is σ = 56257728. Its totient is φ = 9376284.

The previous prime is 28128853. The next prime is 28128883. The reversal of 28128858 is 85882182.

It is a sphenic number, since it is the product of 3 distinct primes.

28128858 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (28128853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2344066 + ... + 2344077.

It is an arithmetic number, because the mean of its divisors is an integer number (7032216).

Almost surely, 2^28128858 is an apocalyptic number.

28128858 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28128858 is a wasteful number, since it uses less digits than its factorization.

28128858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4688148.

The product of its digits is 81920, while the sum is 42.

The square root of 28128858 is about 5303.6645821545. The cubic root of 28128858 is about 304.1240044083.

The spelling of 28128858 in words is "twenty-eight million, one hundred twenty-eight thousand, eight hundred fifty-eight".