67436381 has 2 divisors, whose sum is σ = 67436382. Its totient is φ = 67436380.

The previous prime is 67436363. The next prime is 67436419. The reversal of 67436381 is 18363476.

It is an a-pointer prime, because the next prime (67436419) can be obtained adding 67436381 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62552281 + 4884100 = 7909^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 67436381 - 2¹⁴ = 67419997 is a prime.

It is a super-2 number, since 2×67436381² = 9095330964754322, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67436081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33718190 + 33718191.

It is an arithmetic number, because the mean of its divisors is an integer number (33718191).

Almost surely, 2^67436381 is an apocalyptic number.

It is an amenable number.

67436381 is a deficient number, since it is larger than the sum of its proper divisors (1).

67436381 is an equidigital number, since it uses as much as digits as its factorization.

67436381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 38.

The square root of 67436381 is about 8211.9657208247. The cubic root of 67436381 is about 407.0346848478.

The spelling of 67436381 in words is "sixty-seven million, four hundred thirty-six thousand, three hundred eighty-one".