71864218 has 4 divisors (see below), whose sum is σ = 107796330. Its totient is φ = 35932108.

The previous prime is 71864201. The next prime is 71864257. The reversal of 71864218 is 81246817.

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., 60419529 + 11444689 = 7773^2 + 3383^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17966053 + ... + 17966056.

Almost surely, 2^71864218 is an apocalyptic number.

71864218 is a deficient number, since it is larger than the sum of its proper divisors (35932112).

71864218 is a wasteful number, since it uses less digits than its factorization.

71864218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35932111.

The product of its digits is 21504, while the sum is 37.

The square root of 71864218 is about 8477.2765673888. The cubic root of 71864218 is about 415.7550834306.

The spelling of 71864218 in words is "seventy-one million, eight hundred sixty-four thousand, two hundred eighteen".