78343679 has 2 divisors, whose sum is σ = 78343680. Its totient is φ = 78343678.

The previous prime is 78343663. The next prime is 78343709. The reversal of 78343679 is 97634387.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78343679 - 2⁴ = 78343663 is a prime.

It is a super-2 number, since 2×78343679² = 12275464078510082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78343609) 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, 39171839 + 39171840.

It is an arithmetic number, because the mean of its divisors is an integer number (39171840).

Almost surely, 2^78343679 is an apocalyptic number.

78343679 is a deficient number, since it is larger than the sum of its proper divisors (1).

78343679 is an equidigital number, since it uses as much as digits as its factorization.

78343679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 47.

The square root of 78343679 is about 8851.1964727939. The cubic root of 78343679 is about 427.8924799791.

The spelling of 78343679 in words is "seventy-eight million, three hundred forty-three thousand, six hundred seventy-nine".