28305001 has 2 divisors, whose sum is σ = 28305002. Its totient is φ = 28305000.

The previous prime is 28304999. The next prime is 28305029. The reversal of 28305001 is 10050382.

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., 28302400 + 2601 = 5320^2 + 51^2 .

It is a cyclic number.

It is not a de Polignac number, because 28305001 - 2¹ = 28304999 is a prime.

It is a super-2 number, since 2×28305001² = 1602346163220002, which contains 22 as substring.

Together with 28304999, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28305001.

It is not a weakly prime, because it can be changed into another prime (28305061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14152500 + 14152501.

It is an arithmetic number, because the mean of its divisors is an integer number (14152501).

Almost surely, 2^28305001 is an apocalyptic number.

It is an amenable number.

28305001 is a deficient number, since it is larger than the sum of its proper divisors (1).

28305001 is an equidigital number, since it uses as much as digits as its factorization.

28305001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 28305001 is about 5320.2444492711. The cubic root of 28305001 is about 304.7574924418.

Adding to 28305001 its reverse (10050382), we get a palindrome (38355383).

The spelling of 28305001 in words is "twenty-eight million, three hundred five thousand, one".