28102293 has 12 divisors (see below), whose sum is σ = 40829100. Its totient is φ = 18625536.

The previous prime is 28102289. The next prime is 28102303. The reversal of 28102293 is 39220182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24980004 + 3122289 = 4998^2 + 1767^2 .

It is not a de Polignac number, because 28102293 - 2² = 28102289 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28102253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7468 + ... + 10581.

It is an arithmetic number, because the mean of its divisors is an integer number (3402425).

Almost surely, 2^28102293 is an apocalyptic number.

It is an amenable number.

28102293 is a deficient number, since it is larger than the sum of its proper divisors (12726807).

28102293 is a wasteful number, since it uses less digits than its factorization.

28102293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18228 (or 18225 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28102293 is about 5301.1595901274. The cubic root of 28102293 is about 304.0282356334.

The spelling of 28102293 in words is "twenty-eight million, one hundred two thousand, two hundred ninety-three".