78820267 has 2 divisors, whose sum is σ = 78820268. Its totient is φ = 78820266.

The previous prime is 78820253. The next prime is 78820309. The reversal of 78820267 is 76202887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78820267 - 2¹¹ = 78818219 is a prime.

It is not a weakly prime, because it can be changed into another prime (78820237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39410133 + 39410134.

It is an arithmetic number, because the mean of its divisors is an integer number (39410134).

Almost surely, 2^78820267 is an apocalyptic number.

78820267 is a deficient number, since it is larger than the sum of its proper divisors (1).

78820267 is an equidigital number, since it uses as much as digits as its factorization.

78820267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 78820267 is about 8878.0778888226. The cubic root of 78820267 is about 428.7583923989.

The spelling of 78820267 in words is "seventy-eight million, eight hundred twenty thousand, two hundred sixty-seven".