673656329 has 2 divisors, whose sum is σ = 673656330. Its totient is φ = 673656328.

The previous prime is 673656301. The next prime is 673656413. The reversal of 673656329 is 923656376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642876025 + 30780304 = 25355^2 + 5548^2 .

It is a cyclic number.

It is not a de Polignac number, because 673656329 - 2²⁸ = 405220873 is a prime.

It is not a weakly prime, because it can be changed into another prime (673656829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336828164 + 336828165.

It is an arithmetic number, because the mean of its divisors is an integer number (336828165).

Almost surely, 2^673656329 is an apocalyptic number.

It is an amenable number.

673656329 is a deficient number, since it is larger than the sum of its proper divisors (1).

673656329 is an equidigital number, since it uses as much as digits as its factorization.

673656329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 47.

The square root of 673656329 is about 25954.8902713920. The cubic root of 673656329 is about 876.6228729121.

Adding to 673656329 its sum of digits (47), we get a palindrome (673656376).

The spelling of 673656329 in words is "six hundred seventy-three million, six hundred fifty-six thousand, three hundred twenty-nine".