78842807 has 2 divisors, whose sum is σ = 78842808. Its totient is φ = 78842806.

The previous prime is 78842791. The next prime is 78842809. The reversal of 78842807 is 70824887.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78842807 - 2⁴ = 78842791 is a prime.

Together with 78842809, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78842809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39421403 + 39421404.

It is an arithmetic number, because the mean of its divisors is an integer number (39421404).

Almost surely, 2^78842807 is an apocalyptic number.

78842807 is a deficient number, since it is larger than the sum of its proper divisors (1).

78842807 is an equidigital number, since it uses as much as digits as its factorization.

78842807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200704, while the sum is 44.

The square root of 78842807 is about 8879.3472169974. The cubic root of 78842807 is about 428.7992587626.

The spelling of 78842807 in words is "seventy-eight million, eight hundred forty-two thousand, eight hundred seven".