28305071 has 2 divisors, whose sum is σ = 28305072. Its totient is φ = 28305070.

The previous prime is 28305061. The next prime is 28305097. The reversal of 28305071 is 17050382.

It is an a-pointer prime, because the next prime (28305097) can be obtained adding 28305071 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28305071 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28305071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28305001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14152535 + 14152536.

It is an arithmetic number, because the mean of its divisors is an integer number (14152536).

Almost surely, 2^28305071 is an apocalyptic number.

28305071 is a deficient number, since it is larger than the sum of its proper divisors (1).

28305071 is an equidigital number, since it uses as much as digits as its factorization.

28305071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 28305071 is about 5320.2510279121. The cubic root of 28305071 is about 304.7577436695.

The spelling of 28305071 in words is "twenty-eight million, three hundred five thousand, seventy-one".