78741979 has 2 divisors, whose sum is σ = 78741980. Its totient is φ = 78741978.

The previous prime is 78741913. The next prime is 78741991. The reversal of 78741979 is 97914787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78741979 - 2¹⁹ = 78217691 is a prime.

It is not a weakly prime, because it can be changed into another prime (78741379) 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, 39370989 + 39370990.

It is an arithmetic number, because the mean of its divisors is an integer number (39370990).

Almost surely, 2^78741979 is an apocalyptic number.

78741979 is a deficient number, since it is larger than the sum of its proper divisors (1).

78741979 is an equidigital number, since it uses as much as digits as its factorization.

78741979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 52.

The square root of 78741979 is about 8873.6677309893. The cubic root of 78741979 is about 428.6163910340.

The spelling of 78741979 in words is "seventy-eight million, seven hundred forty-one thousand, nine hundred seventy-nine".