71644723 has 2 divisors, whose sum is σ = 71644724. Its totient is φ = 71644722.

The previous prime is 71644709. The next prime is 71644757. The reversal of 71644723 is 32744617.

It is an a-pointer prime, because the next prime (71644757) can be obtained adding 71644723 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71644723 - 2⁹ = 71644211 is a prime.

It is not a weakly prime, because it can be changed into another prime (71644423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35822361 + 35822362.

It is an arithmetic number, because the mean of its divisors is an integer number (35822362).

Almost surely, 2^71644723 is an apocalyptic number.

71644723 is a deficient number, since it is larger than the sum of its proper divisors (1).

71644723 is an equidigital number, since it uses as much as digits as its factorization.

71644723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 34.

The square root of 71644723 is about 8464.3205870288. The cubic root of 71644723 is about 415.3313712759.

The spelling of 71644723 in words is "seventy-one million, six hundred forty-four thousand, seven hundred twenty-three".