71666706 has 32 divisors (see below), whose sum is σ = 150009408. Its totient is φ = 22800960.

The previous prime is 71666701. The next prime is 71666717. The reversal of 71666706 is 60766617.

It is a super-2 number, since 2×71666706² = 10272233497780872, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) 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 (71666701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8721 + ... + 14811.

It is an arithmetic number, because the mean of its divisors is an integer number (4687794).

Almost surely, 2^71666706 is an apocalyptic number.

71666706 is an abundant number, since it is smaller than the sum of its proper divisors (78342702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71666706 is a wasteful number, since it uses less digits than its factorization.

71666706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6186.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 71666706 is about 8465.6190559226. The cubic root of 71666706 is about 415.3738461226.

The spelling of 71666706 in words is "seventy-one million, six hundred sixty-six thousand, seven hundred six".