673696649 has 2 divisors, whose sum is σ = 673696650. Its totient is φ = 673696648.

The previous prime is 673696631. The next prime is 673696679. The reversal of 673696649 is 946696376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 618417424 + 55279225 = 24868^2 + 7435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-673696649 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 673696594 and 673696603.

It is not a weakly prime, because it can be changed into another prime (673696679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336848324 + 336848325.

It is an arithmetic number, because the mean of its divisors is an integer number (336848325).

Almost surely, 2^673696649 is an apocalyptic number.

It is an amenable number.

673696649 is a deficient number, since it is larger than the sum of its proper divisors (1).

673696649 is an equidigital number, since it uses as much as digits as its factorization.

673696649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 56.

The square root of 673696649 is about 25955.6669920077. Note that the first 3 decimals coincide. The cubic root of 673696649 is about 876.6403619133.

The spelling of 673696649 in words is "six hundred seventy-three million, six hundred ninety-six thousand, six hundred forty-nine".