28638293 has 2 divisors, whose sum is σ = 28638294. Its totient is φ = 28638292.

The previous prime is 28638287. The next prime is 28638299. The reversal of 28638293 is 39283682.

It is a balanced prime because it is at equal distance from previous prime (28638287) and next prime (28638299).

It can be written as a sum of positive squares in only one way, i.e., 19864849 + 8773444 = 4457^2 + 2962^2 .

It is a cyclic number.

It is not a de Polignac number, because 28638293 - 2⁴ = 28638277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28638293.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28638299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14319146 + 14319147.

It is an arithmetic number, because the mean of its divisors is an integer number (14319147).

Almost surely, 2^28638293 is an apocalyptic number.

It is an amenable number.

28638293 is a deficient number, since it is larger than the sum of its proper divisors (1).

28638293 is an equidigital number, since it uses as much as digits as its factorization.

28638293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The square root of 28638293 is about 5351.4757777645. The cubic root of 28638293 is about 305.9490032777.

The spelling of 28638293 in words is "twenty-eight million, six hundred thirty-eight thousand, two hundred ninety-three".