71321636 has 6 divisors (see below), whose sum is σ = 124812870. Its totient is φ = 35660816.

The previous prime is 71321617. The next prime is 71321693. The reversal of 71321636 is 63612317.

It can be written as a sum of positive squares in only one way, i.e., 46321636 + 25000000 = 6806^2 + 5000^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71321599 and 71321608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8915201 + ... + 8915208.

It is an arithmetic number, because the mean of its divisors is an integer number (20802145).

Almost surely, 2^71321636 is an apocalyptic number.

It is an amenable number.

71321636 is a deficient number, since it is larger than the sum of its proper divisors (53491234).

71321636 is a wasteful number, since it uses less digits than its factorization.

71321636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17830413 (or 17830411 counting only the distinct ones).

The product of its digits is 4536, while the sum is 29.

The square root of 71321636 is about 8445.2137924389. The cubic root of 71321636 is about 414.7061082727.

The spelling of 71321636 in words is "seventy-one million, three hundred twenty-one thousand, six hundred thirty-six".