67684381 has 2 divisors, whose sum is σ = 67684382. Its totient is φ = 67684380.

The previous prime is 67684307. The next prime is 67684453. The reversal of 67684381 is 18348676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65464281 + 2220100 = 8091^2 + 1490^2 .

It is a cyclic number.

It is not a de Polignac number, because 67684381 - 2¹¹ = 67682333 is a prime.

It is a super-2 number, since 2×67684381² = 9162350862706322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67681381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33842190 + 33842191.

It is an arithmetic number, because the mean of its divisors is an integer number (33842191).

Almost surely, 2^67684381 is an apocalyptic number.

It is an amenable number.

67684381 is a deficient number, since it is larger than the sum of its proper divisors (1).

67684381 is an equidigital number, since it uses as much as digits as its factorization.

67684381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 67684381 is about 8227.0517805591. The cubic root of 67684381 is about 407.5330365779.

The spelling of 67684381 in words is "sixty-seven million, six hundred eighty-four thousand, three hundred eighty-one".