78274839679 has 2 divisors, whose sum is σ = 78274839680. Its totient is φ = 78274839678.

The previous prime is 78274839647. The next prime is 78274839689. The reversal of 78274839679 is 97693847287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78274839679 - 2⁵ = 78274839647 is a prime.

It is a super-2 number, since 2×78274839679² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78274839689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39137419839 + 39137419840.

It is an arithmetic number, because the mean of its divisors is an integer number (39137419840).

Almost surely, 2^78274839679 is an apocalyptic number.

78274839679 is a deficient number, since it is larger than the sum of its proper divisors (1).

78274839679 is an equidigital number, since it uses as much as digits as its factorization.

78274839679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 256048128, while the sum is 70.

The spelling of 78274839679 in words is "seventy-eight billion, two hundred seventy-four million, eight hundred thirty-nine thousand, six hundred seventy-nine".