28066340 has 24 divisors (see below), whose sum is σ = 59039232. Its totient is φ = 11207520.

The previous prime is 28066333. The next prime is 28066343. The reversal of 28066340 is 4366082.

It is not an unprimeable number, because it can be changed into a prime (28066343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21095 + ... + 22385.

It is an arithmetic number, because the mean of its divisors is an integer number (2459968).

Almost surely, 2^28066340 is an apocalyptic number.

28066340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28066340 is an abundant number, since it is smaller than the sum of its proper divisors (30972892).

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

28066340 is a wasteful number, since it uses less digits than its factorization.

28066340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387 (or 2385 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 28066340 is about 5297.7674543151. The cubic root of 28066340 is about 303.8985262662.

The spelling of 28066340 in words is "twenty-eight million, sixty-six thousand, three hundred forty".