672887321 has 2 divisors, whose sum is σ = 672887322. Its totient is φ = 672887320.

The previous prime is 672887239. The next prime is 672887329. The reversal of 672887321 is 123788276.

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., 672883600 + 3721 = 25940^2 + 61^2 .

It is a cyclic number.

It is not a de Polignac number, because 672887321 - 2¹⁰ = 672886297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (672887329) 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, 336443660 + 336443661.

It is an arithmetic number, because the mean of its divisors is an integer number (336443661).

Almost surely, 2^672887321 is an apocalyptic number.

It is an amenable number.

672887321 is a deficient number, since it is larger than the sum of its proper divisors (1).

672887321 is an equidigital number, since it uses as much as digits as its factorization.

672887321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 44.

The square root of 672887321 is about 25940.0717231082. The cubic root of 672887321 is about 876.2891781916.

It can be divided in two parts, 6728 and 87321, that added together give a palindrome (94049).

The spelling of 672887321 in words is "six hundred seventy-two million, eight hundred eighty-seven thousand, three hundred twenty-one".