71671005 has 72 divisors (see below), whose sum is σ = 146470272. Its totient is φ = 31755456.

The previous prime is 71670931. The next prime is 71671007. The reversal of 71671005 is 50017617.

It is not a de Polignac number, because 71671005 - 2⁷ = 71670877 is a prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 71671005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71671007) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 695784 + ... + 695886.

Almost surely, 2^71671005 is an apocalyptic number.

It is an amenable number.

71671005 is an abundant number, since it is smaller than the sum of its proper divisors (74799267).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71671005 is a wasteful number, since it uses less digits than its factorization.

71671005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 27.

The square root of 71671005 is about 8465.8729614848. The cubic root of 71671005 is about 415.3821514969.

The spelling of 71671005 in words is "seventy-one million, six hundred seventy-one thousand, five".