67045681 has 4 divisors (see below), whose sum is σ = 67124772. Its totient is φ = 66966592.

The previous prime is 67045673. The next prime is 67045697. The reversal of 67045681 is 18654076.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27920656 + 39125025 = 5284^2 + 6255^2 .

It is a cyclic number.

It is not a de Polignac number, because 67045681 - 2³ = 67045673 is a prime.

It is a super-2 number, since 2×67045681² = 8990246681507522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67045681.

It is not an unprimeable number, because it can be changed into a prime (67045081) 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, 38260 + ... + 39973.

It is an arithmetic number, because the mean of its divisors is an integer number (16781193).

Almost surely, 2^67045681 is an apocalyptic number.

It is an amenable number.

67045681 is a deficient number, since it is larger than the sum of its proper divisors (79091).

67045681 is an equidigital number, since it uses as much as digits as its factorization.

67045681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79090.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 67045681 is about 8188.1427075986. The cubic root of 67045681 is about 406.2470953323.

The spelling of 67045681 in words is "sixty-seven million, forty-five thousand, six hundred eighty-one".