71640587 has 2 divisors, whose sum is σ = 71640588. Its totient is φ = 71640586.

The previous prime is 71640581. The next prime is 71640629. The reversal of 71640587 is 78504617.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71640587 - 2⁶ = 71640523 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71640587.

It is not a weakly prime, because it can be changed into another prime (71640581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35820293 + 35820294.

It is an arithmetic number, because the mean of its divisors is an integer number (35820294).

Almost surely, 2^71640587 is an apocalyptic number.

71640587 is a deficient number, since it is larger than the sum of its proper divisors (1).

71640587 is an equidigital number, since it uses as much as digits as its factorization.

71640587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 71640587 is about 8464.0762638341. The cubic root of 71640587 is about 415.3233788585.

It can be divided in two parts, 71640 and 587, that added together give a palindrome (72227).

The spelling of 71640587 in words is "seventy-one million, six hundred forty thousand, five hundred eighty-seven".