86788769 has 2 divisors, whose sum is σ = 86788770. Its totient is φ = 86788768.

The previous prime is 86788753. The next prime is 86788771. The reversal of 86788769 is 96788768.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53875600 + 32913169 = 7340^2 + 5737^2 .

It is a cyclic number.

It is not a de Polignac number, because 86788769 - 2⁴ = 86788753 is a prime.

It is a super-2 number, since 2×86788769² = 15064580849070722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 86788771, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (86788799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43394384 + 43394385.

It is an arithmetic number, because the mean of its divisors is an integer number (43394385).

Almost surely, 2^86788769 is an apocalyptic number.

It is an amenable number.

86788769 is a deficient number, since it is larger than the sum of its proper divisors (1).

86788769 is an equidigital number, since it uses as much as digits as its factorization.

86788769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8128512, while the sum is 59.

The square root of 86788769 is about 9316.0490015886. The cubic root of 86788769 is about 442.7458605827.

Subtracting 86788769 from its reverse (96788768), we obtain a palindrome (9999999).

The spelling of 86788769 in words is "eighty-six million, seven hundred eighty-eight thousand, seven hundred sixty-nine".