71645842 has 16 divisors (see below), whose sum is σ = 110218392. Its totient is φ = 34917120.

The previous prime is 71645797. The next prime is 71645843. The reversal of 71645842 is 24854617.

It can be written as a sum of positive squares in 4 ways, for example, as 18224361 + 53421481 = 4269^2 + 7309^2 .

It is not an unprimeable number, because it can be changed into a prime (71645843) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11188 + ... + 16384.

Almost surely, 2^71645842 is an apocalyptic number.

71645842 is a deficient number, since it is larger than the sum of its proper divisors (38572550).

71645842 is a wasteful number, since it uses less digits than its factorization.

71645842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5373.

The product of its digits is 53760, while the sum is 37.

The square root of 71645842 is about 8464.3866877642. The cubic root of 71645842 is about 415.3335335817. Note that the first 3 decimals are identical.

The spelling of 71645842 in words is "seventy-one million, six hundred forty-five thousand, eight hundred forty-two".