67005706 has 4 divisors (see below), whose sum is σ = 100508562. Its totient is φ = 33502852.

The previous prime is 67005703. The next prime is 67005737. The reversal of 67005706 is 60750076.

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., 56175025 + 10830681 = 7495^2 + 3291^2 .

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 (67005703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16751425 + ... + 16751428.

Almost surely, 2^67005706 is an apocalyptic number.

67005706 is a deficient number, since it is larger than the sum of its proper divisors (33502856).

67005706 is a wasteful number, since it uses less digits than its factorization.

67005706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33502855.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 67005706 is about 8185.7013138765. The cubic root of 67005706 is about 406.1663396643.

The spelling of 67005706 in words is "sixty-seven million, five thousand, seven hundred six".