28642529 has 2 divisors, whose sum is σ = 28642530. Its totient is φ = 28642528.

The previous prime is 28642513. The next prime is 28642531. The reversal of 28642529 is 92524682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23571025 + 5071504 = 4855^2 + 2252^2 .

It is a cyclic number.

It is not a de Polignac number, because 28642529 - 2⁴ = 28642513 is a prime.

Together with 28642531, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28642492 and 28642501.

It is not a weakly prime, because it can be changed into another prime (28642829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14321264 + 14321265.

It is an arithmetic number, because the mean of its divisors is an integer number (14321265).

Almost surely, 2^28642529 is an apocalyptic number.

It is an amenable number.

28642529 is a deficient number, since it is larger than the sum of its proper divisors (1).

28642529 is an equidigital number, since it uses as much as digits as its factorization.

28642529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 28642529 is about 5351.8715418067. The cubic root of 28642529 is about 305.9640872317.

The spelling of 28642529 in words is "twenty-eight million, six hundred forty-two thousand, five hundred twenty-nine".