78505927 has 2 divisors, whose sum is σ = 78505928. Its totient is φ = 78505926.

The previous prime is 78505909. The next prime is 78505937. The reversal of 78505927 is 72950587.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78505927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78505937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39252963 + 39252964.

It is an arithmetic number, because the mean of its divisors is an integer number (39252964).

Almost surely, 2^78505927 is an apocalyptic number.

78505927 is a deficient number, since it is larger than the sum of its proper divisors (1).

78505927 is an equidigital number, since it uses as much as digits as its factorization.

78505927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 78505927 is about 8860.3570469818. The cubic root of 78505927 is about 428.1876615406.

The spelling of 78505927 in words is "seventy-eight million, five hundred five thousand, nine hundred twenty-seven".