86781647 has 2 divisors, whose sum is σ = 86781648. Its totient is φ = 86781646.

The previous prime is 86781641. The next prime is 86781649. The reversal of 86781647 is 74618768.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86781647 - 2⁴ = 86781631 is a prime.

Together with 86781649, 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 (86781641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43390823 + 43390824.

It is an arithmetic number, because the mean of its divisors is an integer number (43390824).

Almost surely, 2^86781647 is an apocalyptic number.

86781647 is a deficient number, since it is larger than the sum of its proper divisors (1).

86781647 is an equidigital number, since it uses as much as digits as its factorization.

86781647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 47.

The square root of 86781647 is about 9315.6667501580. Note that the first 3 decimals coincide. The cubic root of 86781647 is about 442.7337494831.

The spelling of 86781647 in words is "eighty-six million, seven hundred eighty-one thousand, six hundred forty-seven".