28279447 has 8 divisors (see below), whose sum is σ = 32381856. Its totient is φ = 24192672.

The previous prime is 28279441. The next prime is 28279451. The reversal of 28279447 is 74497282.

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

It is a de Polignac number, because none of the positive numbers 2^k-28279447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28279441) 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, 273 + ... + 7525.

It is an arithmetic number, because the mean of its divisors is an integer number (4047732).

Almost surely, 2^28279447 is an apocalyptic number.

28279447 is a deficient number, since it is larger than the sum of its proper divisors (4102409).

28279447 is an equidigital number, since it uses as much as digits as its factorization.

28279447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7817.

The product of its digits is 225792, while the sum is 43.

The square root of 28279447 is about 5317.8423256054. The cubic root of 28279447 is about 304.6657522606.

The spelling of 28279447 in words is "twenty-eight million, two hundred seventy-nine thousand, four hundred forty-seven".