28134293 has 4 divisors (see below), whose sum is σ = 30691968. Its totient is φ = 25576620.

The previous prime is 28134287. The next prime is 28134331. The reversal of 28134293 is 39243182.

It is a happy number.

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 28134293 - 2¹⁸ = 27872149 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 (28134283) 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, 1278821 + ... + 1278842.

It is an arithmetic number, because the mean of its divisors is an integer number (7672992).

Almost surely, 2^28134293 is an apocalyptic number.

It is an amenable number.

28134293 is a deficient number, since it is larger than the sum of its proper divisors (2557675).

28134293 is a wasteful number, since it uses less digits than its factorization.

28134293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557674.

The product of its digits is 10368, while the sum is 32.

The square root of 28134293 is about 5304.1769389793. The cubic root of 28134293 is about 304.1435905514.

Subtracting 28134293 from its reverse (39243182), we obtain a square (11108889 = 3333²).

The spelling of 28134293 in words is "twenty-eight million, one hundred thirty-four thousand, two hundred ninety-three".