28342939 has 4 divisors (see below), whose sum is σ = 28397656. Its totient is φ = 28288224.

The previous prime is 28342933. The next prime is 28342957. The reversal of 28342939 is 93924382.

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 28342939 - 2⁹ = 28342427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28342933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26574 + ... + 27619.

It is an arithmetic number, because the mean of its divisors is an integer number (7099414).

Almost surely, 2^28342939 is an apocalyptic number.

28342939 is a deficient number, since it is larger than the sum of its proper divisors (54717).

28342939 is an equidigital number, since it uses as much as digits as its factorization.

28342939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54716.

The product of its digits is 93312, while the sum is 40.

The square root of 28342939 is about 5323.8086930317. The cubic root of 28342939 is about 304.8935900406.

The spelling of 28342939 in words is "twenty-eight million, three hundred forty-two thousand, nine hundred thirty-nine".