78340204387 has 2 divisors, whose sum is σ = 78340204388. Its totient is φ = 78340204386.

The previous prime is 78340204379. The next prime is 78340204441.

It is a happy number.

78340204387 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 78340204387 - 2³ = 78340204379 is a prime.

It is a super-2 number, since 2×78340204387² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78340204357) 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, 39170102193 + 39170102194.

It is an arithmetic number, because the mean of its divisors is an integer number (39170102194).

Almost surely, 2^78340204387 is an apocalyptic number.

78340204387 is a deficient number, since it is larger than the sum of its proper divisors (1).

78340204387 is an equidigital number, since it uses as much as digits as its factorization.

78340204387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 903168, while the sum is 46.

The spelling of 78340204387 in words is "seventy-eight billion, three hundred forty million, two hundred four thousand, three hundred eighty-seven".