28763293 has 6 divisors (see below), whose sum is σ = 31146234. Its totient is φ = 26550576.

The previous prime is 28763291. The next prime is 28763299. The reversal of 28763293 is 39236782.

It can be written as a sum of positive squares in 3 ways, for example, as 1951609 + 26811684 = 1397^2 + 5178^2 .

It is not a de Polignac number, because 28763293 - 2¹ = 28763291 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 (28763291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84930 + ... + 85267.

It is an arithmetic number, because the mean of its divisors is an integer number (5191039).

Almost surely, 2^28763293 is an apocalyptic number.

It is an amenable number.

28763293 is a deficient number, since it is larger than the sum of its proper divisors (2382941).

28763293 is a wasteful number, since it uses less digits than its factorization.

28763293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170223 (or 170210 counting only the distinct ones).

The product of its digits is 108864, while the sum is 40.

The square root of 28763293 is about 5363.1420827720. The cubic root of 28763293 is about 306.3934911085.

The spelling of 28763293 in words is "twenty-eight million, seven hundred sixty-three thousand, two hundred ninety-three".