28135340 has 48 divisors (see below), whose sum is σ = 63376992. Its totient is φ = 10454016.

The previous prime is 28135339. The next prime is 28135361. The reversal of 28135340 is 4353182.

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, 27722 + ... + 28718.

It is an arithmetic number, because the mean of its divisors is an integer number (1320354).

Almost surely, 2^28135340 is an apocalyptic number.

28135340 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 28135340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31688496).

28135340 is an abundant number, since it is smaller than the sum of its proper divisors (35241652).

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

28135340 is a wasteful number, since it uses less digits than its factorization.

28135340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106 (or 1104 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 28135340 is about 5304.2756338637. The cubic root of 28135340 is about 304.1473633420.

The spelling of 28135340 in words is "twenty-eight million, one hundred thirty-five thousand, three hundred forty".