67783381 has 2 divisors, whose sum is σ = 67783382. Its totient is φ = 67783380.

The previous prime is 67783367. The next prime is 67783399. The reversal of 67783381 is 18338776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67076100 + 707281 = 8190^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 67783381 - 2⁵ = 67783349 is a prime.

It is a super-2 number, since 2×67783381² = 9189173479582322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67733381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33891690 + 33891691.

It is an arithmetic number, because the mean of its divisors is an integer number (33891691).

Almost surely, 2^67783381 is an apocalyptic number.

It is an amenable number.

67783381 is a deficient number, since it is larger than the sum of its proper divisors (1).

67783381 is an equidigital number, since it uses as much as digits as its factorization.

67783381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 43.

The square root of 67783381 is about 8233.0663182073. The cubic root of 67783381 is about 407.7316354034.

The spelling of 67783381 in words is "sixty-seven million, seven hundred eighty-three thousand, three hundred eighty-one".