28308629 has 2 divisors, whose sum is σ = 28308630. Its totient is φ = 28308628.

The previous prime is 28308619. The next prime is 28308649. The reversal of 28308629 is 92680382.

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., 27804529 + 504100 = 5273^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 28308629 - 2¹² = 28304533 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28308592 and 28308601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28308619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14154314 + 14154315.

It is an arithmetic number, because the mean of its divisors is an integer number (14154315).

Almost surely, 2^28308629 is an apocalyptic number.

It is an amenable number.

28308629 is a deficient number, since it is larger than the sum of its proper divisors (1).

28308629 is an equidigital number, since it uses as much as digits as its factorization.

28308629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 28308629 is about 5320.5854001228. The cubic root of 28308629 is about 304.7705126727.

The spelling of 28308629 in words is "twenty-eight million, three hundred eight thousand, six hundred twenty-nine".