28163293 has 8 divisors (see below), whose sum is σ = 30014208. Its totient is φ = 26364624.

The previous prime is 28163287. The next prime is 28163309. The reversal of 28163293 is 39236182.

It is a happy number.

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

It is not a de Polignac number, because 28163293 - 2⁹ = 28162781 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 (28163243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11946 + ... + 14107.

It is an arithmetic number, because the mean of its divisors is an integer number (3751776).

Almost surely, 2^28163293 is an apocalyptic number.

28163293 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28163293 is a deficient number, since it is larger than the sum of its proper divisors (1850915).

28163293 is a wasteful number, since it uses less digits than its factorization.

28163293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26123.

The product of its digits is 15552, while the sum is 34.

The square root of 28163293 is about 5306.9099295164. The cubic root of 28163293 is about 304.2480554162.

The spelling of 28163293 in words is "twenty-eight million, one hundred sixty-three thousand, two hundred ninety-three".