78248638439 has 2 divisors, whose sum is σ = 78248638440. Its totient is φ = 78248638438.

The previous prime is 78248638393. The next prime is 78248638441. The reversal of 78248638439 is 93483684287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78248638439 - 2²⁰ = 78247589863 is a prime.

It is a super-2 number, since 2×78248638439² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 78248638441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78248632439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39124319219 + 39124319220.

It is an arithmetic number, because the mean of its divisors is an integer number (39124319220).

Almost surely, 2^78248638439 is an apocalyptic number.

78248638439 is a deficient number, since it is larger than the sum of its proper divisors (1).

78248638439 is an equidigital number, since it uses as much as digits as its factorization.

78248638439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55738368, while the sum is 62.

The spelling of 78248638439 in words is "seventy-eight billion, two hundred forty-eight million, six hundred thirty-eight thousand, four hundred thirty-nine".