78936427 has 2 divisors, whose sum is σ = 78936428. Its totient is φ = 78936426.

The previous prime is 78936401. The next prime is 78936461. The reversal of 78936427 is 72463987.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78936427 is a prime.

It is not a weakly prime, because it can be changed into another prime (78936467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39468213 + 39468214.

It is an arithmetic number, because the mean of its divisors is an integer number (39468214).

Almost surely, 2^78936427 is an apocalyptic number.

78936427 is a deficient number, since it is larger than the sum of its proper divisors (1).

78936427 is an equidigital number, since it uses as much as digits as its factorization.

78936427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 46.

The square root of 78936427 is about 8884.6174368962. The cubic root of 78936427 is about 428.9689140941.

The spelling of 78936427 in words is "seventy-eight million, nine hundred thirty-six thousand, four hundred twenty-seven".