78066647 has 2 divisors, whose sum is σ = 78066648. Its totient is φ = 78066646.

The previous prime is 78066643. The next prime is 78066661. The reversal of 78066647 is 74666087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78066647 - 2² = 78066643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78066598 and 78066607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78066643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39033323 + 39033324.

It is an arithmetic number, because the mean of its divisors is an integer number (39033324).

Almost surely, 2^78066647 is an apocalyptic number.

78066647 is a deficient number, since it is larger than the sum of its proper divisors (1).

78066647 is an equidigital number, since it uses as much as digits as its factorization.

78066647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 78066647 is about 8835.5332040574. The cubic root of 78066647 is about 427.3875257841.

The spelling of 78066647 in words is "seventy-eight million, sixty-six thousand, six hundred forty-seven".