28871436 has 24 divisors (see below), whose sum is σ = 73491264. Its totient is φ = 8748880.

The previous prime is 28871429. The next prime is 28871459. The reversal of 28871436 is 63417882.

It is a junction number, because it is equal to n+sod(n) for n = 28871394 and 28871403.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 109230 + ... + 109493.

It is an arithmetic number, because the mean of its divisors is an integer number (3062136).

Almost surely, 2^28871436 is an apocalyptic number.

It is an amenable number.

28871436 is an abundant number, since it is smaller than the sum of its proper divisors (44619828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28871436 is a wasteful number, since it uses less digits than its factorization.

28871436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218741 (or 218739 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 28871436 is about 5373.2146802450. The cubic root of 28871436 is about 306.7769992622.

The spelling of 28871436 in words is "twenty-eight million, eight hundred seventy-one thousand, four hundred thirty-six".