71431636 has 12 divisors (see below), whose sum is σ = 125237728. Its totient is φ = 35649432.

The previous prime is 71431627. The next prime is 71431639. The reversal of 71431636 is 63613417.

71431636 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

71431636 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 71431598 and 71431607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71431639) 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 in 3 ways as a sum of consecutive naturals, for example, 14136 + ... + 18511.

Almost surely, 2^71431636 is an apocalyptic number.

It is an amenable number.

71431636 is a deficient number, since it is larger than the sum of its proper divisors (53806092).

71431636 is a wasteful number, since it uses less digits than its factorization.

71431636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33198 (or 33196 counting only the distinct ones).

The product of its digits is 9072, while the sum is 31.

The square root of 71431636 is about 8451.7238478313. The cubic root of 71431636 is about 414.9192004112.

The spelling of 71431636 in words is "seventy-one million, four hundred thirty-one thousand, six hundred thirty-six".