28340371 has 4 divisors (see below), whose sum is σ = 28368144. Its totient is φ = 28312600.

The previous prime is 28340329. The next prime is 28340383. The reversal of 28340371 is 17304382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28340371 - 2¹⁷ = 28209299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28340171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12295 + ... + 14416.

It is an arithmetic number, because the mean of its divisors is an integer number (7092036).

Almost surely, 2^28340371 is an apocalyptic number.

28340371 is a deficient number, since it is larger than the sum of its proper divisors (27773).

28340371 is a wasteful number, since it uses less digits than its factorization.

28340371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27772.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 28340371 is about 5323.5675068510. The cubic root of 28340371 is about 304.8843815109.

The spelling of 28340371 in words is "twenty-eight million, three hundred forty thousand, three hundred seventy-one".