672490681 has 2 divisors, whose sum is σ = 672490682. Its totient is φ = 672490680.

The previous prime is 672490669. The next prime is 672490691. The reversal of 672490681 is 186094276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403005625 + 269485056 = 20075^2 + 16416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672490681 is a prime.

It is a super-2 number, since 2×672490681² = 904487432063687522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (672490601) 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, 336245340 + 336245341.

It is an arithmetic number, because the mean of its divisors is an integer number (336245341).

Almost surely, 2^672490681 is an apocalyptic number.

It is an amenable number.

672490681 is a deficient number, since it is larger than the sum of its proper divisors (1).

672490681 is an equidigital number, since it uses as much as digits as its factorization.

672490681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 672490681 is about 25932.4252818744. The cubic root of 672490681 is about 876.1169652795.

The spelling of 672490681 in words is "six hundred seventy-two million, four hundred ninety thousand, six hundred eighty-one".