78738767 has 2 divisors, whose sum is σ = 78738768. Its totient is φ = 78738766.

The previous prime is 78738743. The next prime is 78738773. The reversal of 78738767 is 76783787.

It is a strong prime.

It is an emirp because it is prime and its reverse (76783787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78738767 - 2⁸ = 78738511 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 (78738727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39369383 + 39369384.

It is an arithmetic number, because the mean of its divisors is an integer number (39369384).

Almost surely, 2^78738767 is an apocalyptic number.

78738767 is a deficient number, since it is larger than the sum of its proper divisors (1).

78738767 is an equidigital number, since it uses as much as digits as its factorization.

78738767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2765952, while the sum is 53.

The square root of 78738767 is about 8873.4867442286. The cubic root of 78738767 is about 428.6105629925.

The spelling of 78738767 in words is "seventy-eight million, seven hundred thirty-eight thousand, seven hundred sixty-seven".