71324540 has 48 divisors (see below), whose sum is σ = 171659712. Its totient is φ = 24385536.

The previous prime is 71324527. The next prime is 71324563. The reversal of 71324540 is 4542317.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93842 + ... + 94598.

It is an arithmetic number, because the mean of its divisors is an integer number (3576244).

Almost surely, 2^71324540 is an apocalyptic number.

71324540 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71324540 is an abundant number, since it is smaller than the sum of its proper divisors (100335172).

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

71324540 is a wasteful number, since it uses less digits than its factorization.

71324540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446 (or 1444 counting only the distinct ones).

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

The square root of 71324540 is about 8445.3857223930. The cubic root of 71324540 is about 414.7117367200.

Adding to 71324540 its reverse (4542317), we get a palindrome (75866857).

The spelling of 71324540 in words is "seventy-one million, three hundred twenty-four thousand, five hundred forty".