71806066 has 4 divisors (see below), whose sum is σ = 107709102. Its totient is φ = 35903032.

The previous prime is 71806037. The next prime is 71806067. The reversal of 71806066 is 66060817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66060817 = 113 ⋅584609.

It can be written as a sum of positive squares in only one way, i.e., 68641225 + 3164841 = 8285^2 + 1779^2 .

It is a super-2 number, since 2×71806066² = 10312222228792712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71806067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17951515 + ... + 17951518.

Almost surely, 2^71806066 is an apocalyptic number.

71806066 is a deficient number, since it is larger than the sum of its proper divisors (35903036).

71806066 is a wasteful number, since it uses less digits than its factorization.

71806066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35903035.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 71806066 is about 8473.8459981286. The cubic root of 71806066 is about 415.6429111772.

The spelling of 71806066 in words is "seventy-one million, eight hundred six thousand, sixty-six".