28279293 has 32 divisors (see below), whose sum is σ = 44390400. Its totient is φ = 15681600.

The previous prime is 28279291. The next prime is 28279301. The reversal of 28279293 is 39297282.

It is not a de Polignac number, because 28279293 - 2¹ = 28279291 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28279291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142008 + ... + 142206.

It is an arithmetic number, because the mean of its divisors is an integer number (1387200).

Almost surely, 2^28279293 is an apocalyptic number.

It is an amenable number.

28279293 is a deficient number, since it is larger than the sum of its proper divisors (16111107).

28279293 is a wasteful number, since it uses less digits than its factorization.

28279293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377.

The product of its digits is 108864, while the sum is 42.

The square root of 28279293 is about 5317.8278460289. The cubic root of 28279293 is about 304.6651992251.

The spelling of 28279293 in words is "twenty-eight million, two hundred seventy-nine thousand, two hundred ninety-three".