28343289 has 8 divisors (see below), whose sum is σ = 40698112. Its totient is φ = 17442000.

The previous prime is 28343279. The next prime is 28343309. The reversal of 28343289 is 98234382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28343289 - 2⁵ = 28343257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 726751 = 28343289 / (2 + 8 + 3 + 4 + 3 + 2 + 8 + 9).

It is not an unprimeable number, because it can be changed into a prime (28343219) 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, 363337 + ... + 363414.

It is an arithmetic number, because the mean of its divisors is an integer number (5087264).

Almost surely, 2^28343289 is an apocalyptic number.

It is an amenable number.

28343289 is a deficient number, since it is larger than the sum of its proper divisors (12354823).

28343289 is a wasteful number, since it uses less digits than its factorization.

28343289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726767.

The product of its digits is 82944, while the sum is 39.

The square root of 28343289 is about 5323.8415641339. The cubic root of 28343289 is about 304.8948450542.

The spelling of 28343289 in words is "twenty-eight million, three hundred forty-three thousand, two hundred eighty-nine".