71644427 has 2 divisors, whose sum is σ = 71644428. Its totient is φ = 71644426.

The previous prime is 71644423. The next prime is 71644429. The reversal of 71644427 is 72444617.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71644427 - 2² = 71644423 is a prime.

Together with 71644429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71644423) 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 as a sum of consecutive naturals, namely, 35822213 + 35822214.

It is an arithmetic number, because the mean of its divisors is an integer number (35822214).

Almost surely, 2^71644427 is an apocalyptic number.

71644427 is a deficient number, since it is larger than the sum of its proper divisors (1).

71644427 is an equidigital number, since it uses as much as digits as its factorization.

71644427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 35.

The square root of 71644427 is about 8464.3031018507. The cubic root of 71644427 is about 415.3307992950.

The spelling of 71644427 in words is "seventy-one million, six hundred forty-four thousand, four hundred twenty-seven".