87829309 has 2 divisors, whose sum is σ = 87829310. Its totient is φ = 87829308.

The previous prime is 87829303. The next prime is 87829319. The reversal of 87829309 is 90392878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71402500 + 16426809 = 8450^2 + 4053^2 .

It is a cyclic number.

It is not a de Polignac number, because 87829309 - 2¹¹ = 87827261 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87829303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43914654 + 43914655.

It is an arithmetic number, because the mean of its divisors is an integer number (43914655).

Almost surely, 2^87829309 is an apocalyptic number.

It is an amenable number.

87829309 is a deficient number, since it is larger than the sum of its proper divisors (1).

87829309 is an equidigital number, since it uses as much as digits as its factorization.

87829309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 87829309 is about 9371.7292427812. The cubic root of 87829309 is about 444.5082460744.

The spelling of 87829309 in words is "eighty-seven million, eight hundred twenty-nine thousand, three hundred nine".