78784331 has 2 divisors, whose sum is σ = 78784332. Its totient is φ = 78784330.

The previous prime is 78784319. The next prime is 78784333. The reversal of 78784331 is 13348787.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78784331 is a prime.

It is a super-2 number, since 2×78784331² = 12413941622235122, which contains 22 as substring.

Together with 78784333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78784333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39392165 + 39392166.

It is an arithmetic number, because the mean of its divisors is an integer number (39392166).

Almost surely, 2^78784331 is an apocalyptic number.

78784331 is a deficient number, since it is larger than the sum of its proper divisors (1).

78784331 is an equidigital number, since it uses as much as digits as its factorization.

78784331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 41.

The square root of 78784331 is about 8876.0537965923. The cubic root of 78784331 is about 428.6932221732.

The spelling of 78784331 in words is "seventy-eight million, seven hundred eighty-four thousand, three hundred thirty-one".