78386663 has 2 divisors, whose sum is σ = 78386664. Its totient is φ = 78386662.

The previous prime is 78386657. The next prime is 78386669. The reversal of 78386663 is 36668387.

It is a balanced prime because it is at equal distance from previous prime (78386657) and next prime (78386669).

It is a cyclic number.

It is not a de Polignac number, because 78386663 - 2¹⁶ = 78321127 is a prime.

It is a super-2 number, since 2×78386663² = 12288937872551138, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78386669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39193331 + 39193332.

It is an arithmetic number, because the mean of its divisors is an integer number (39193332).

Almost surely, 2^78386663 is an apocalyptic number.

78386663 is a deficient number, since it is larger than the sum of its proper divisors (1).

78386663 is an equidigital number, since it uses as much as digits as its factorization.

78386663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The square root of 78386663 is about 8853.6242861328. The cubic root of 78386663 is about 427.9707214228.

The spelling of 78386663 in words is "seventy-eight million, three hundred eighty-six thousand, six hundred sixty-three".