78784938079 has 2 divisors, whose sum is σ = 78784938080. Its totient is φ = 78784938078.

The previous prime is 78784938031. The next prime is 78784938083. The reversal of 78784938079 is 97083948787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78784938079 - 2⁷ = 78784937951 is a prime.

It is a super-2 number, since 2×78784938079² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78784937999 and 78784938017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78784938779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39392469039 + 39392469040.

It is an arithmetic number, because the mean of its divisors is an integer number (39392469040).

Almost surely, 2^78784938079 is an apocalyptic number.

78784938079 is a deficient number, since it is larger than the sum of its proper divisors (1).

78784938079 is an equidigital number, since it uses as much as digits as its factorization.

78784938079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170698752, while the sum is 70.

The spelling of 78784938079 in words is "seventy-eight billion, seven hundred eighty-four million, nine hundred thirty-eight thousand, seventy-nine".