28305929 has 2 divisors, whose sum is σ = 28305930. Its totient is φ = 28305928.

The previous prime is 28305913. The next prime is 28305947. The reversal of 28305929 is 92950382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26988025 + 1317904 = 5195^2 + 1148^2 .

It is a cyclic number.

It is not a de Polignac number, because 28305929 - 2⁴ = 28305913 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28305892 and 28305901.

It is not a weakly prime, because it can be changed into another prime (28305029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14152964 + 14152965.

It is an arithmetic number, because the mean of its divisors is an integer number (14152965).

Almost surely, 2^28305929 is an apocalyptic number.

It is an amenable number.

28305929 is a deficient number, since it is larger than the sum of its proper divisors (1).

28305929 is an equidigital number, since it uses as much as digits as its factorization.

28305929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 28305929 is about 5320.3316625940. The cubic root of 28305929 is about 304.7608229706.

The spelling of 28305929 in words is "twenty-eight million, three hundred five thousand, nine hundred twenty-nine".