78945287 has 2 divisors, whose sum is σ = 78945288. Its totient is φ = 78945286.

The previous prime is 78945233. The next prime is 78945311. The reversal of 78945287 is 78254987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78945287 - 2¹⁰ = 78944263 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 (78945227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39472643 + 39472644.

It is an arithmetic number, because the mean of its divisors is an integer number (39472644).

Almost surely, 2^78945287 is an apocalyptic number.

78945287 is a deficient number, since it is larger than the sum of its proper divisors (1).

78945287 is an equidigital number, since it uses as much as digits as its factorization.

78945287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 50.

The square root of 78945287 is about 8885.1160375090. The cubic root of 78945287 is about 428.9849629684.

The spelling of 78945287 in words is "seventy-eight million, nine hundred forty-five thousand, two hundred eighty-seven".