78382879 has 2 divisors, whose sum is σ = 78382880. Its totient is φ = 78382878.

The previous prime is 78382877. The next prime is 78382921. The reversal of 78382879 is 97828387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78382879 - 2¹ = 78382877 is a prime.

It is a super-2 number, since 2×78382879² = 12287751440657282, which contains 22 as substring.

Together with 78382877, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78382877) 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, 39191439 + 39191440.

It is an arithmetic number, because the mean of its divisors is an integer number (39191440).

Almost surely, 2^78382879 is an apocalyptic number.

78382879 is a deficient number, since it is larger than the sum of its proper divisors (1).

78382879 is an equidigital number, since it uses as much as digits as its factorization.

78382879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 52.

The square root of 78382879 is about 8853.4105857573. The cubic root of 78382879 is about 427.9638347612.

The spelling of 78382879 in words is "seventy-eight million, three hundred eighty-two thousand, eight hundred seventy-nine".