673391647 has 2 divisors, whose sum is σ = 673391648. Its totient is φ = 673391646.

The previous prime is 673391617. The next prime is 673391651. The reversal of 673391647 is 746193376.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 673391647 - 2²³ = 665003039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 673391597 and 673391606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673391617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336695823 + 336695824.

It is an arithmetic number, because the mean of its divisors is an integer number (336695824).

Almost surely, 2^673391647 is an apocalyptic number.

673391647 is a deficient number, since it is larger than the sum of its proper divisors (1).

673391647 is an equidigital number, since it uses as much as digits as its factorization.

673391647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 46.

The square root of 673391647 is about 25949.7908854773. The cubic root of 673391647 is about 876.5080484436.

It can be divided in two parts, 67339 and 1647, that added together give a palindrome (68986).

The spelling of 673391647 in words is "six hundred seventy-three million, three hundred ninety-one thousand, six hundred forty-seven".