78788287 has 2 divisors, whose sum is σ = 78788288. Its totient is φ = 78788286.

The previous prime is 78788257. The next prime is 78788291. The reversal of 78788287 is 78288787.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78788287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78788257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39394143 + 39394144.

It is an arithmetic number, because the mean of its divisors is an integer number (39394144).

Almost surely, 2^78788287 is an apocalyptic number.

78788287 is a deficient number, since it is larger than the sum of its proper divisors (1).

78788287 is an equidigital number, since it uses as much as digits as its factorization.

78788287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2809856, while the sum is 55.

The square root of 78788287 is about 8876.2766405740. The cubic root of 78788287 is about 428.7003973816.

Subtracting from 78788287 its reverse (78288787), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 78788287 in words is "seventy-eight million, seven hundred eighty-eight thousand, two hundred eighty-seven".