28408273 has 2 divisors, whose sum is σ = 28408274. Its totient is φ = 28408272.

The previous prime is 28408253. The next prime is 28408279. The reversal of 28408273 is 37280482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22118209 + 6290064 = 4703^2 + 2508^2 .

It is a cyclic number.

It is not a de Polignac number, because 28408273 - 2¹⁷ = 28277201 is a prime.

It is not a weakly prime, because it can be changed into another prime (28408279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14204136 + 14204137.

It is an arithmetic number, because the mean of its divisors is an integer number (14204137).

Almost surely, 2^28408273 is an apocalyptic number.

It is an amenable number.

28408273 is a deficient number, since it is larger than the sum of its proper divisors (1).

28408273 is an equidigital number, since it uses as much as digits as its factorization.

28408273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 28408273 is about 5329.9411816642. The cubic root of 28408273 is about 305.1276828120.

The spelling of 28408273 in words is "twenty-eight million, four hundred eight thousand, two hundred seventy-three".