78805667 has 2 divisors, whose sum is σ = 78805668. Its totient is φ = 78805666.

The previous prime is 78805663. The next prime is 78805703. The reversal of 78805667 is 76650887.

It is a weak prime.

It is an emirp because it is prime and its reverse (76650887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78805667 - 2² = 78805663 is a prime.

It is not a weakly prime, because it can be changed into another prime (78805663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39402833 + 39402834.

It is an arithmetic number, because the mean of its divisors is an integer number (39402834).

Almost surely, 2^78805667 is an apocalyptic number.

78805667 is a deficient number, since it is larger than the sum of its proper divisors (1).

78805667 is an equidigital number, since it uses as much as digits as its factorization.

78805667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 47.

The square root of 78805667 is about 8877.2556006910. The cubic root of 78805667 is about 428.7319175707.

The spelling of 78805667 in words is "seventy-eight million, eight hundred five thousand, six hundred sixty-seven".