28785293 has 2 divisors, whose sum is σ = 28785294. Its totient is φ = 28785292.

The previous prime is 28785283. The next prime is 28785331. The reversal of 28785293 is 39258782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26234884 + 2550409 = 5122^2 + 1597^2 .

It is a cyclic number.

It is not a de Polignac number, because 28785293 - 2²² = 24590989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28785283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14392646 + 14392647.

It is an arithmetic number, because the mean of its divisors is an integer number (14392647).

Almost surely, 2^28785293 is an apocalyptic number.

It is an amenable number.

28785293 is a deficient number, since it is larger than the sum of its proper divisors (1).

28785293 is an equidigital number, since it uses as much as digits as its factorization.

28785293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 28785293 is about 5365.1927272000. The cubic root of 28785293 is about 306.4715876252.

The spelling of 28785293 in words is "twenty-eight million, seven hundred eighty-five thousand, two hundred ninety-three".