28996309 has 2 divisors, whose sum is σ = 28996310. Its totient is φ = 28996308.

The previous prime is 28996249. The next prime is 28996313. The reversal of 28996309 is 90369982.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24059025 + 4937284 = 4905^2 + 2222^2 .

It is a cyclic number.

It is not a de Polignac number, because 28996309 - 2¹³ = 28988117 is a prime.

It is a Chen prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28996349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14498154 + 14498155.

It is an arithmetic number, because the mean of its divisors is an integer number (14498155).

Almost surely, 2^28996309 is an apocalyptic number.

It is an amenable number.

28996309 is a deficient number, since it is larger than the sum of its proper divisors (1).

28996309 is an equidigital number, since it uses as much as digits as its factorization.

28996309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 28996309 is about 5384.8220954828. The cubic root of 28996309 is about 307.2186476231.

The spelling of 28996309 in words is "twenty-eight million, nine hundred ninety-six thousand, three hundred nine".