67673681 has 2 divisors, whose sum is σ = 67673682. Its totient is φ = 67673680.

The previous prime is 67673677. The next prime is 67673693. The reversal of 67673681 is 18637676.

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., 39753025 + 27920656 = 6305^2 + 5284^2 .

It is a cyclic number.

It is not a de Polignac number, because 67673681 - 2² = 67673677 is a prime.

It is a super-2 number, since 2×67673681² = 9159454200179522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (67673381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33836840 + 33836841.

It is an arithmetic number, because the mean of its divisors is an integer number (33836841).

Almost surely, 2^67673681 is an apocalyptic number.

It is an amenable number.

67673681 is a deficient number, since it is larger than the sum of its proper divisors (1).

67673681 is an equidigital number, since it uses as much as digits as its factorization.

67673681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 44.

The square root of 67673681 is about 8226.4014611493. The cubic root of 67673681 is about 407.5115602627.

The spelling of 67673681 in words is "sixty-seven million, six hundred seventy-three thousand, six hundred eighty-one".