71321632 has 24 divisors (see below), whose sum is σ = 143841852. Its totient is φ = 34790400.

The previous prime is 71321617. The next prime is 71321693. The reversal of 71321632 is 23612317.

It can be written as a sum of positive squares in 2 ways, for example, as 67305616 + 4016016 = 8204^2 + 2004^2 .

It is a super-2 number, since 2×71321632² = 10173550382286848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71321597 and 71321606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25869 + ... + 28492.

Almost surely, 2^71321632 is an apocalyptic number.

It is an amenable number.

71321632 is an abundant number, since it is smaller than the sum of its proper divisors (72520220).

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

71321632 is a wasteful number, since it uses less digits than its factorization.

71321632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54412 (or 54404 counting only the distinct ones).

The product of its digits is 1512, while the sum is 25.

The square root of 71321632 is about 8445.2135556184. The cubic root of 71321632 is about 414.7061005199.

Adding to 71321632 its reverse (23612317), we get a palindrome (94933949).

The spelling of 71321632 in words is "seventy-one million, three hundred twenty-one thousand, six hundred thirty-two".