28486309 has 2 divisors, whose sum is σ = 28486310. Its totient is φ = 28486308.

The previous prime is 28486307. The next prime is 28486331. The reversal of 28486309 is 90368482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18105025 + 10381284 = 4255^2 + 3222^2 .

It is a cyclic number.

It is not a de Polignac number, because 28486309 - 2¹ = 28486307 is a prime.

It is a super-2 number, since 2×28486309² = 1622939600886962, which contains 22 as substring.

Together with 28486307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28486307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14243154 + 14243155.

It is an arithmetic number, because the mean of its divisors is an integer number (14243155).

Almost surely, 2^28486309 is an apocalyptic number.

It is an amenable number.

28486309 is a deficient number, since it is larger than the sum of its proper divisors (1).

28486309 is an equidigital number, since it uses as much as digits as its factorization.

28486309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 28486309 is about 5337.2566923467. The cubic root of 28486309 is about 305.4068171638.

The spelling of 28486309 in words is "twenty-eight million, four hundred eighty-six thousand, three hundred nine".