28106838 has 48 divisors (see below), whose sum is σ = 63737856. Its totient is φ = 9282600.

The previous prime is 28106807. The next prime is 28106839. The reversal of 28106838 is 83860182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28106839) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73195 + ... + 73577.

It is an arithmetic number, because the mean of its divisors is an integer number (1327872).

Almost surely, 2^28106838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28106838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31868928).

28106838 is an abundant number, since it is smaller than the sum of its proper divisors (35631018).

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

28106838 is a wasteful number, since it uses less digits than its factorization.

28106838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28106838 is about 5301.5882525900. The cubic root of 28106838 is about 304.0446249703.

The spelling of 28106838 in words is "twenty-eight million, one hundred six thousand, eight hundred thirty-eight".