28743319 has 4 divisors (see below), whose sum is σ = 31356360. Its totient is φ = 26130280.

The previous prime is 28743313. The next prime is 28743329. The reversal of 28743319 is 91334782.

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

It is a de Polignac number, because none of the positive numbers 2^k-28743319 is a prime.

It is a super-2 number, since 2×28743319² = 1652356774271522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28743313) 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, 1306504 + ... + 1306525.

It is an arithmetic number, because the mean of its divisors is an integer number (7839090).

Almost surely, 2^28743319 is an apocalyptic number.

28743319 is a deficient number, since it is larger than the sum of its proper divisors (2613041).

28743319 is a wasteful number, since it uses less digits than its factorization.

28743319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613040.

The product of its digits is 36288, while the sum is 37.

The square root of 28743319 is about 5361.2796047212. The cubic root of 28743319 is about 306.3225520735.

It can be divided in two parts, 28 and 743319, that added together give a palindrome (743347).

The spelling of 28743319 in words is "twenty-eight million, seven hundred forty-three thousand, three hundred nineteen".