67067681 has 4 divisors (see below), whose sum is σ = 67084164. Its totient is φ = 67051200.

The previous prime is 67067629. The next prime is 67067683. The reversal of 67067681 is 18676076.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6477025 + 60590656 = 2545^2 + 7784^2 .

It is a cyclic number.

It is not a de Polignac number, because 67067681 - 2¹⁴ = 67051297 is a prime.

It is a super-2 number, since 2×67067681² = 8996147669435522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67067683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2741 + ... + 11901.

It is an arithmetic number, because the mean of its divisors is an integer number (16771041).

Almost surely, 2^67067681 is an apocalyptic number.

It is an amenable number.

67067681 is a deficient number, since it is larger than the sum of its proper divisors (16483).

67067681 is an equidigital number, since it uses as much as digits as its factorization.

67067681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16482.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 67067681 is about 8189.4860034071. The cubic root of 67067681 is about 406.2915250335.

The spelling of 67067681 in words is "sixty-seven million, sixty-seven thousand, six hundred eighty-one".