71640629 has 2 divisors, whose sum is σ = 71640630. Its totient is φ = 71640628.

The previous prime is 71640587. The next prime is 71640637. The reversal of 71640629 is 92604617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54789604 + 16851025 = 7402^2 + 4105^2 .

It is a cyclic number.

It is not a de Polignac number, because 71640629 - 2¹² = 71636533 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71640649) 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, 35820314 + 35820315.

It is an arithmetic number, because the mean of its divisors is an integer number (35820315).

Almost surely, 2^71640629 is an apocalyptic number.

It is an amenable number.

71640629 is a deficient number, since it is larger than the sum of its proper divisors (1).

71640629 is an equidigital number, since it uses as much as digits as its factorization.

71640629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 71640629 is about 8464.0787449078. The cubic root of 71640629 is about 415.3234600209.

The spelling of 71640629 in words is "seventy-one million, six hundred forty thousand, six hundred twenty-nine".