672790381 has 2 divisors, whose sum is σ = 672790382. Its totient is φ = 672790380.

The previous prime is 672790379. The next prime is 672790397. The reversal of 672790381 is 183097276.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 454755625 + 218034756 = 21325^2 + 14766^2 .

It is a cyclic number.

It is not a de Polignac number, because 672790381 - 2¹ = 672790379 is a prime.

It is a super-2 number, since 2×672790381² = 905293793532250322, which contains 22 as substring.

Together with 672790379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (672790681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336395190 + 336395191.

It is an arithmetic number, because the mean of its divisors is an integer number (336395191).

Almost surely, 2^672790381 is an apocalyptic number.

It is an amenable number.

672790381 is a deficient number, since it is larger than the sum of its proper divisors (1).

672790381 is an equidigital number, since it uses as much as digits as its factorization.

672790381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 672790381 is about 25938.2031181807. The cubic root of 672790381 is about 876.2470950919.

The spelling of 672790381 in words is "six hundred seventy-two million, seven hundred ninety thousand, three hundred eighty-one".