78765287 has 2 divisors, whose sum is σ = 78765288. Its totient is φ = 78765286.

The previous prime is 78765263. The next prime is 78765319. The reversal of 78765287 is 78256787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78765287 - 2⁸ = 78765031 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 (78765187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39382643 + 39382644.

It is an arithmetic number, because the mean of its divisors is an integer number (39382644).

Almost surely, 2^78765287 is an apocalyptic number.

78765287 is a deficient number, since it is larger than the sum of its proper divisors (1).

78765287 is an equidigital number, since it uses as much as digits as its factorization.

78765287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1317120, while the sum is 50.

The square root of 78765287 is about 8874.9809577261. The cubic root of 78765287 is about 428.6586776915.

The spelling of 78765287 in words is "seventy-eight million, seven hundred sixty-five thousand, two hundred eighty-seven".