71243530 has 16 divisors (see below), whose sum is σ = 130045824. Its totient is φ = 28095760.

The previous prime is 71243509. The next prime is 71243533. The reversal of 71243530 is 3534217.

It is a junction number, because it is equal to n+sod(n) for n = 71243495 and 71243504.

It is not an unprimeable number, because it can be changed into a prime (71243533) 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, 49462 + ... + 50881.

It is an arithmetic number, because the mean of its divisors is an integer number (8127864).

Almost surely, 2^71243530 is an apocalyptic number.

71243530 is a deficient number, since it is larger than the sum of its proper divisors (58802294).

71243530 is a wasteful number, since it uses less digits than its factorization.

71243530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100421.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 71243530 is about 8440.5882496423. The cubic root of 71243530 is about 414.5546681751.

Adding to 71243530 its reverse (3534217), we get a palindrome (74777747).

The spelling of 71243530 in words is "seventy-one million, two hundred forty-three thousand, five hundred thirty".