672385817 has 2 divisors, whose sum is σ = 672385818. Its totient is φ = 672385816.

The previous prime is 672385783. The next prime is 672385829. The reversal of 672385817 is 718583276.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 645718921 + 26666896 = 25411^2 + 5164^2 .

It is a cyclic number.

It is not a de Polignac number, because 672385817 - 2¹⁰ = 672384793 is a prime.

It is not a weakly prime, because it can be changed into another prime (672385897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336192908 + 336192909.

It is an arithmetic number, because the mean of its divisors is an integer number (336192909).

Almost surely, 2^672385817 is an apocalyptic number.

It is an amenable number.

672385817 is a deficient number, since it is larger than the sum of its proper divisors (1).

672385817 is an equidigital number, since it uses as much as digits as its factorization.

672385817 is an odious number, because the sum of its binary digits is odd.

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

The square root of 672385817 is about 25930.4033327675. The cubic root of 672385817 is about 876.0714241750.

The spelling of 672385817 in words is "six hundred seventy-two million, three hundred eighty-five thousand, eight hundred seventeen".