67639213 has 2 divisors, whose sum is σ = 67639214. Its totient is φ = 67639212.

The previous prime is 67639189. The next prime is 67639237. The reversal of 67639213 is 31293676.

It is a balanced prime because it is at equal distance from previous prime (67639189) and next prime (67639237).

It can be written as a sum of positive squares in only one way, i.e., 65334889 + 2304324 = 8083^2 + 1518^2 .

It is a cyclic number.

It is not a de Polignac number, because 67639213 - 2⁵ = 67639181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67639283) 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, 33819606 + 33819607.

It is an arithmetic number, because the mean of its divisors is an integer number (33819607).

Almost surely, 2^67639213 is an apocalyptic number.

It is an amenable number.

67639213 is a deficient number, since it is larger than the sum of its proper divisors (1).

67639213 is an equidigital number, since it uses as much as digits as its factorization.

67639213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 37.

The square root of 67639213 is about 8224.3062321390. The cubic root of 67639213 is about 407.4423630327.

The spelling of 67639213 in words is "sixty-seven million, six hundred thirty-nine thousand, two hundred thirteen".