71289684 has 18 divisors (see below), whose sum is σ = 180204570. Its totient is φ = 23763216.

The previous prime is 71289671. The next prime is 71289703. The reversal of 71289684 is 48698217.

It can be written as a sum of positive squares in only one way, i.e., 66879684 + 4410000 = 8178^2 + 2100^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 990099 + ... + 990170.

It is an arithmetic number, because the mean of its divisors is an integer number (10011365).

Almost surely, 2^71289684 is an apocalyptic number.

It is an amenable number.

71289684 is an abundant number, since it is smaller than the sum of its proper divisors (108914886).

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

71289684 is a wasteful number, since it uses less digits than its factorization.

71289684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980279 (or 1980274 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 71289684 is about 8443.3218581314. The cubic root of 71289684 is about 414.6441697570.

The spelling of 71289684 in words is "seventy-one million, two hundred eighty-nine thousand, six hundred eighty-four".