71768218 has 4 divisors (see below), whose sum is σ = 107652330. Its totient is φ = 35884108.

The previous prime is 71768209. The next prime is 71768231. The reversal of 71768218 is 81286717.

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., 55308969 + 16459249 = 7437^2 + 4057^2 .

It is a super-2 number, since 2×71768218² = 10301354229791048, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17942053 + ... + 17942056.

Almost surely, 2^71768218 is an apocalyptic number.

71768218 is a deficient number, since it is larger than the sum of its proper divisors (35884112).

71768218 is a wasteful number, since it uses less digits than its factorization.

71768218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35884111.

The product of its digits is 37632, while the sum is 40.

The square root of 71768218 is about 8471.6124793336. The cubic root of 71768218 is about 415.5698717693.

The spelling of 71768218 in words is "seventy-one million, seven hundred sixty-eight thousand, two hundred eighteen".