28128342 has 32 divisors (see below), whose sum is σ = 62296704. Its totient is φ = 8395200.

The previous prime is 28128329. The next prime is 28128343. The reversal of 28128342 is 24382182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28128343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1242 + ... + 7602.

It is an arithmetic number, because the mean of its divisors is an integer number (1946772).

Almost surely, 2^28128342 is an apocalyptic number.

28128342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28128342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31148352).

28128342 is an abundant number, since it is smaller than the sum of its proper divisors (34168362).

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

28128342 is a wasteful number, since it uses less digits than its factorization.

28128342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6444.

The product of its digits is 6144, while the sum is 30.

The square root of 28128342 is about 5303.6159363212. The cubic root of 28128342 is about 304.1221447647.

The spelling of 28128342 in words is "twenty-eight million, one hundred twenty-eight thousand, three hundred forty-two".