71244643 has 4 divisors (see below), whose sum is σ = 71550648. Its totient is φ = 70938640.

The previous prime is 71244617. The next prime is 71244653. The reversal of 71244643 is 34644217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34644217 = 47 ⋅737111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71244643 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71244653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152653 + ... + 153118.

It is an arithmetic number, because the mean of its divisors is an integer number (17887662).

Almost surely, 2^71244643 is an apocalyptic number.

71244643 is a deficient number, since it is larger than the sum of its proper divisors (306005).

71244643 is a wasteful number, since it uses less digits than its factorization.

71244643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306004.

The product of its digits is 16128, while the sum is 31.

The square root of 71244643 is about 8440.6541808085. The cubic root of 71244643 is about 414.5568269533.

The spelling of 71244643 in words is "seventy-one million, two hundred forty-four thousand, six hundred forty-three".