28513229 has 2 divisors, whose sum is σ = 28513230. Its totient is φ = 28513228.

The previous prime is 28513213. The next prime is 28513259. The reversal of 28513229 is 92231582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28408900 + 104329 = 5330^2 + 323^2 .

It is a cyclic number.

It is not a de Polignac number, because 28513229 - 2⁴ = 28513213 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28513195 and 28513204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28513259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14256614 + 14256615.

It is an arithmetic number, because the mean of its divisors is an integer number (14256615).

Almost surely, 2^28513229 is an apocalyptic number.

It is an amenable number.

28513229 is a deficient number, since it is larger than the sum of its proper divisors (1).

28513229 is an equidigital number, since it uses as much as digits as its factorization.

28513229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 28513229 is about 5339.7779916397. Note that the first 3 decimals coincide. The cubic root of 28513229 is about 305.5029915874.

The spelling of 28513229 in words is "twenty-eight million, five hundred thirteen thousand, two hundred twenty-nine".