71325440 has 72 divisors (see below), whose sum is σ = 172824288. Its totient is φ = 28200960.

The previous prime is 71325431. The next prime is 71325481. The reversal of 71325440 is 4452317.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131570 + ... + 132110.

Almost surely, 2^71325440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71325440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86412144).

71325440 is an abundant number, since it is smaller than the sum of its proper divisors (101498848).

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

71325440 is a wasteful number, since it uses less digits than its factorization.

71325440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 71325440 is about 8445.4390057593. The cubic root of 71325440 is about 414.7134810424.

Adding to 71325440 its reverse (4452317), we get a palindrome (75777757).

The spelling of 71325440 in words is "seventy-one million, three hundred twenty-five thousand, four hundred forty".