78452947 has 2 divisors, whose sum is σ = 78452948. Its totient is φ = 78452946.

The previous prime is 78452939. The next prime is 78452951. The reversal of 78452947 is 74925487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78452947 - 2³ = 78452939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78452897 and 78452906.

It is not a weakly prime, because it can be changed into another prime (78450947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39226473 + 39226474.

It is an arithmetic number, because the mean of its divisors is an integer number (39226474).

Almost surely, 2^78452947 is an apocalyptic number.

78452947 is a deficient number, since it is larger than the sum of its proper divisors (1).

78452947 is an equidigital number, since it uses as much as digits as its factorization.

78452947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 46.

The square root of 78452947 is about 8857.3668209011. The cubic root of 78452947 is about 428.0913185501.

The spelling of 78452947 in words is "seventy-eight million, four hundred fifty-two thousand, nine hundred forty-seven".