28871447 has 24 divisors (see below), whose sum is σ = 33707520. Its totient is φ = 24670800.

The previous prime is 28871429. The next prime is 28871459. The reversal of 28871447 is 74417882.

It is a happy number.

It is not a de Polignac number, because 28871447 - 2¹⁰ = 28870423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28871407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161204 + ... + 161382.

It is an arithmetic number, because the mean of its divisors is an integer number (1404480).

Almost surely, 2^28871447 is an apocalyptic number.

28871447 is a deficient number, since it is larger than the sum of its proper divisors (4836073).

28871447 is a wasteful number, since it uses less digits than its factorization.

28871447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 264 counting only the distinct ones).

The product of its digits is 100352, while the sum is 41.

The square root of 28871447 is about 5373.2157038407. The cubic root of 28871447 is about 306.7770382228. Note that the first 3 decimals are identical.

It can be divided in two parts, 2887 and 1447, that added together give a palindrome (4334).

The spelling of 28871447 in words is "twenty-eight million, eight hundred seventy-one thousand, four hundred forty-seven".