71813530 has 16 divisors (see below), whose sum is σ = 130134600. Its totient is φ = 28532032.

The previous prime is 71813513. The next prime is 71813537. The reversal of 71813530 is 3531817.

It can be written as a sum of positive squares in 4 ways, for example, as 54449641 + 17363889 = 7379^2 + 4167^2 .

It is not an unprimeable number, because it can be changed into a prime (71813537) 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 7 ways as a sum of consecutive naturals, for example, 22609 + ... + 25588.

Almost surely, 2^71813530 is an apocalyptic number.

71813530 is a deficient number, since it is larger than the sum of its proper divisors (58321070).

71813530 is a wasteful number, since it uses less digits than its factorization.

71813530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48353.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 71813530 is about 8474.2864006357. The cubic root of 71813530 is about 415.6573122409.

The spelling of 71813530 in words is "seventy-one million, eight hundred thirteen thousand, five hundred thirty".