71640719 has 2 divisors, whose sum is σ = 71640720. Its totient is φ = 71640718.

The previous prime is 71640713. The next prime is 71640731. The reversal of 71640719 is 91704617.

It is a weak prime.

It is an emirp because it is prime and its reverse (91704617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71640719 - 2⁸ = 71640463 is a prime.

It is a super-2 number, since 2×71640719² = 10264785237673922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71640713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35820359 + 35820360.

It is an arithmetic number, because the mean of its divisors is an integer number (35820360).

Almost surely, 2^71640719 is an apocalyptic number.

71640719 is a deficient number, since it is larger than the sum of its proper divisors (1).

71640719 is an equidigital number, since it uses as much as digits as its factorization.

71640719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 71640719 is about 8464.0840614918. The cubic root of 71640719 is about 415.3236339404.

The spelling of 71640719 in words is "seventy-one million, six hundred forty thousand, seven hundred nineteen".