78505267 has 2 divisors, whose sum is σ = 78505268. Its totient is φ = 78505266.

The previous prime is 78505249. The next prime is 78505277. The reversal of 78505267 is 76250587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78505267 - 2⁷ = 78505139 is a prime.

It is not a weakly prime, because it can be changed into another prime (78505277) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39252633 + 39252634.

It is an arithmetic number, because the mean of its divisors is an integer number (39252634).

Almost surely, 2^78505267 is an apocalyptic number.

78505267 is a deficient number, since it is larger than the sum of its proper divisors (1).

78505267 is an equidigital number, since it uses as much as digits as its factorization.

78505267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 78505267 is about 8860.3198023548. The cubic root of 78505267 is about 428.1864616114.

The spelling of 78505267 in words is "seventy-eight million, five hundred five thousand, two hundred sixty-seven".