78338677 has 2 divisors, whose sum is σ = 78338678. Its totient is φ = 78338676.

The previous prime is 78338671. The next prime is 78338693. The reversal of 78338677 is 77683387.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72607441 + 5731236 = 8521^2 + 2394^2 .

It is a cyclic number.

It is not a de Polignac number, because 78338677 - 2⁷ = 78338549 is a prime.

It is a super-2 number, since 2×78338677² = 12273896628220658, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78338677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78338671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39169338 + 39169339.

It is an arithmetic number, because the mean of its divisors is an integer number (39169339).

Almost surely, 2^78338677 is an apocalyptic number.

It is an amenable number.

78338677 is a deficient number, since it is larger than the sum of its proper divisors (1).

78338677 is an equidigital number, since it uses as much as digits as its factorization.

78338677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 49.

The square root of 78338677 is about 8850.9139076143. The cubic root of 78338677 is about 427.8833732511.

The spelling of 78338677 in words is "seventy-eight million, three hundred thirty-eight thousand, six hundred seventy-seven".