28871871 has 8 divisors (see below), whose sum is σ = 43995264. Its totient is φ = 16498200.

The previous prime is 28871863. The next prime is 28871873. The reversal of 28871871 is 17817882.

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

It is not a de Polignac number, because 28871871 - 2³ = 28871863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28871873) 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, 687405 + ... + 687446.

It is an arithmetic number, because the mean of its divisors is an integer number (5499408).

Almost surely, 2^28871871 is an apocalyptic number.

28871871 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28871871 is a deficient number, since it is larger than the sum of its proper divisors (15123393).

28871871 is a wasteful number, since it uses less digits than its factorization.

28871871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374861.

The product of its digits is 50176, while the sum is 42.

The square root of 28871871 is about 5373.2551586538. The cubic root of 28871871 is about 306.7785399698.

The spelling of 28871871 in words is "twenty-eight million, eight hundred seventy-one thousand, eight hundred seventy-one".