78578867 has 2 divisors, whose sum is σ = 78578868. Its totient is φ = 78578866.

The previous prime is 78578809. The next prime is 78578869. The reversal of 78578867 is 76887587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78578867 - 2¹⁸ = 78316723 is a prime.

Together with 78578869, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78578869) 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, 39289433 + 39289434.

It is an arithmetic number, because the mean of its divisors is an integer number (39289434).

Almost surely, 2^78578867 is an apocalyptic number.

78578867 is a deficient number, since it is larger than the sum of its proper divisors (1).

78578867 is an equidigital number, since it uses as much as digits as its factorization.

78578867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5268480, while the sum is 56.

The square root of 78578867 is about 8864.4721783082. The cubic root of 78578867 is about 428.3202304715.

The spelling of 78578867 in words is "seventy-eight million, five hundred seventy-eight thousand, eight hundred sixty-seven".