71666884 has 6 divisors (see below), whose sum is σ = 125417054. Its totient is φ = 35833440.

The previous prime is 71666867. The next prime is 71666899. The reversal of 71666884 is 48866617.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 42614784 + 29052100 = 6528^2 + 5390^2 .

It is a super-2 number, since 2×71666884² = 10272284524538912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8958357 + ... + 8958364.

Almost surely, 2^71666884 is an apocalyptic number.

It is an amenable number.

71666884 is a deficient number, since it is larger than the sum of its proper divisors (53750170).

71666884 is a wasteful number, since it uses less digits than its factorization.

71666884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17916725 (or 17916723 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The square root of 71666884 is about 8465.6295690279. The cubic root of 71666884 is about 415.3741900130.

It can be divided in two parts, 716 and 66884, that added together give a square (67600 = 260²).

The spelling of 71666884 in words is "seventy-one million, six hundred sixty-six thousand, eight hundred eighty-four".