71445445 has 4 divisors (see below), whose sum is σ = 85734540. Its totient is φ = 57156352.

The previous prime is 71445443. The next prime is 71445469. The reversal of 71445445 is 54454417.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28227969 + 43217476 = 5313^2 + 6574^2 .

It is a cyclic number.

It is not a de Polignac number, because 71445445 - 2¹ = 71445443 is a prime.

It is a super-2 number, since 2×71445445² = 10208903222496050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71445445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71445443) 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 3 ways as a sum of consecutive naturals, for example, 7144540 + ... + 7144549.

It is an arithmetic number, because the mean of its divisors is an integer number (21433635).

Almost surely, 2^71445445 is an apocalyptic number.

It is an amenable number.

71445445 is a deficient number, since it is larger than the sum of its proper divisors (14289095).

71445445 is a wasteful number, since it uses less digits than its factorization.

71445445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14289094.

The product of its digits is 44800, while the sum is 34.

The square root of 71445445 is about 8452.5407422857. The cubic root of 71445445 is about 414.9459357644.

The spelling of 71445445 in words is "seventy-one million, four hundred forty-five thousand, four hundred forty-five".