28871293 has 4 divisors (see below), whose sum is σ = 31495968. Its totient is φ = 26246620.

The previous prime is 28871267. The next prime is 28871299. The reversal of 28871293 is 39217882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28871293 - 2⁹ = 28870781 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 (28871299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1312321 + ... + 1312342.

It is an arithmetic number, because the mean of its divisors is an integer number (7873992).

Almost surely, 2^28871293 is an apocalyptic number.

It is an amenable number.

28871293 is a deficient number, since it is larger than the sum of its proper divisors (2624675).

28871293 is a wasteful number, since it uses less digits than its factorization.

28871293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624674.

The product of its digits is 48384, while the sum is 40.

The square root of 28871293 is about 5373.2013734830. The cubic root of 28871293 is about 306.7764927733.

The spelling of 28871293 in words is "twenty-eight million, eight hundred seventy-one thousand, two hundred ninety-three".