67440005 has 4 divisors (see below), whose sum is σ = 80928012. Its totient is φ = 53952000.

The previous prime is 67440001. The next prime is 67440007. The reversal of 67440005 is 50004476.

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 13535041 + 53904964 = 3679^2 + 7342^2 .

It is not a de Polignac number, because 67440005 - 2² = 67440001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67440001) 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, 6743996 + ... + 6744005.

It is an arithmetic number, because the mean of its divisors is an integer number (20232003).

Almost surely, 2^67440005 is an apocalyptic number.

It is an amenable number.

67440005 is a deficient number, since it is larger than the sum of its proper divisors (13488007).

67440005 is a wasteful number, since it uses less digits than its factorization.

67440005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13488006.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 67440005 is about 8212.1863714848. The cubic root of 67440005 is about 407.0419760026.

The spelling of 67440005 in words is "sixty-seven million, four hundred forty thousand, five".