71884136 has 8 divisors (see below), whose sum is σ = 134782770. Its totient is φ = 35942064.

The previous prime is 71884117. The next prime is 71884139. The reversal of 71884136 is 63148817.

It can be written as a sum of positive squares in only one way, i.e., 71402500 + 481636 = 8450^2 + 694^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 71884136.

It is not an unprimeable number, because it can be changed into a prime (71884139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4492751 + ... + 4492766.

Almost surely, 2^71884136 is an apocalyptic number.

It is an amenable number.

71884136 is a deficient number, since it is larger than the sum of its proper divisors (62898634).

71884136 is a wasteful number, since it uses less digits than its factorization.

71884136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8985523 (or 8985519 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 71884136 is about 8478.4512736702. The cubic root of 71884136 is about 415.7934903274.

The spelling of 71884136 in words is "seventy-one million, eight hundred eighty-four thousand, one hundred thirty-six".