28753939 has 4 divisors (see below), whose sum is σ = 29100456. Its totient is φ = 28407424.

The previous prime is 28753937. The next prime is 28753961. The reversal of 28753939 is 93935782.

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 28753939 - 2¹ = 28753937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28753937) 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, 173134 + ... + 173299.

It is an arithmetic number, because the mean of its divisors is an integer number (7275114).

Almost surely, 2^28753939 is an apocalyptic number.

28753939 is a deficient number, since it is larger than the sum of its proper divisors (346517).

28753939 is an equidigital number, since it uses as much as digits as its factorization.

28753939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346516.

The product of its digits is 408240, while the sum is 46.

The square root of 28753939 is about 5362.2699484453. The cubic root of 28753939 is about 306.3602738241.

It can be divided in two parts, 28753 and 939, that added together give a palindrome (29692).

The spelling of 28753939 in words is "twenty-eight million, seven hundred fifty-three thousand, nine hundred thirty-nine".