67006138 has 4 divisors (see below), whose sum is σ = 100509210. Its totient is φ = 33503068.

The previous prime is 67006133. The next prime is 67006157. The reversal of 67006138 is 83160076.

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

It can be written as a sum of positive squares in only one way, i.e., 55696369 + 11309769 = 7463^2 + 3363^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (67006133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16751533 + ... + 16751536.

Almost surely, 2^67006138 is an apocalyptic number.

67006138 is a deficient number, since it is larger than the sum of its proper divisors (33503072).

67006138 is a wasteful number, since it uses less digits than its factorization.

67006138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33503071.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 67006138 is about 8185.7277013104. The cubic root of 67006138 is about 406.1672125426.

The spelling of 67006138 in words is "sixty-seven million, six thousand, one hundred thirty-eight".