87449447 has 2 divisors, whose sum is σ = 87449448. Its totient is φ = 87449446.

The previous prime is 87449423. The next prime is 87449449. The reversal of 87449447 is 74494478.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87449447 - 2¹⁰ = 87448423 is a prime.

Together with 87449449, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87449449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43724723 + 43724724.

It is an arithmetic number, because the mean of its divisors is an integer number (43724724).

Almost surely, 2^87449447 is an apocalyptic number.

87449447 is a deficient number, since it is larger than the sum of its proper divisors (1).

87449447 is an equidigital number, since it uses as much as digits as its factorization.

87449447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 47.

The square root of 87449447 is about 9351.4409050157. The cubic root of 87449447 is about 443.8664868559.

The spelling of 87449447 in words is "eighty-seven million, four hundred forty-nine thousand, four hundred forty-seven".