28871751 has 8 divisors (see below), whose sum is σ = 38697984. Its totient is φ = 19146680.

The previous prime is 28871747. The next prime is 28871753. The reversal of 28871751 is 15717882.

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

It is a cyclic number.

It is not a de Polignac number, because 28871751 - 2² = 28871747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28871753) 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, 24621 + ... + 25766.

It is an arithmetic number, because the mean of its divisors is an integer number (4837248).

Almost surely, 2^28871751 is an apocalyptic number.

28871751 is a deficient number, since it is larger than the sum of its proper divisors (9826233).

28871751 is a wasteful number, since it uses less digits than its factorization.

28871751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50581.

The product of its digits is 31360, while the sum is 39.

The square root of 28871751 is about 5373.2439922267. The cubic root of 28871751 is about 306.7781149485.

The spelling of 28871751 in words is "twenty-eight million, eight hundred seventy-one thousand, seven hundred fifty-one".