678693667 has 2 divisors, whose sum is σ = 678693668. Its totient is φ = 678693666.

The previous prime is 678693647. The next prime is 678693721. The reversal of 678693667 is 766396876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678693667 - 2⁷ = 678693539 is a prime.

It is not a weakly prime, because it can be changed into another prime (678693647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339346833 + 339346834.

It is an arithmetic number, because the mean of its divisors is an integer number (339346834).

Almost surely, 2^678693667 is an apocalyptic number.

678693667 is a deficient number, since it is larger than the sum of its proper divisors (1).

678693667 is an equidigital number, since it uses as much as digits as its factorization.

678693667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13716864, while the sum is 58.

The square root of 678693667 is about 26051.7497876822. The cubic root of 678693667 is about 878.8024632872.

The spelling of 678693667 in words is "six hundred seventy-eight million, six hundred ninety-three thousand, six hundred sixty-seven".