71647 has 2 divisors, whose sum is σ = 71648. Its totient is φ = 71646.

The previous prime is 71633. The next prime is 71663. The reversal of 71647 is 74617.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71647 is a prime.

It is a plaindrome in base 12 and base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35823 + 35824.

It is an arithmetic number, because the mean of its divisors is an integer number (35824).

2⁷¹⁶⁴⁷ is an apocalyptic number.

71647 is a deficient number, since it is larger than the sum of its proper divisors (1).

71647 is an equidigital number, since it uses as much as digits as its factorization.

71647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176, while the sum is 25.

The square root of 71647 is about 267.6695724209. The cubic root of 71647 is about 41.5335771226.

The spelling of 71647 in words is "seventy-one thousand, six hundred forty-seven".