71662005 has 12 divisors (see below), whose sum is σ = 124214220. Its totient is φ = 38219712.

The previous prime is 71661991. The next prime is 71662009. The reversal of 71662005 is 50026617.

It can be written as a sum of positive squares in 2 ways, for example, as 37859409 + 33802596 = 6153^2 + 5814^2 .

It is not a de Polignac number, because 71662005 - 2²⁰ = 70613429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71662005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71662009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 796200 + ... + 796289.

It is an arithmetic number, because the mean of its divisors is an integer number (10351185).

Almost surely, 2^71662005 is an apocalyptic number.

It is an amenable number.

71662005 is a deficient number, since it is larger than the sum of its proper divisors (52552215).

71662005 is a wasteful number, since it uses less digits than its factorization.

71662005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592500 (or 1592497 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 71662005 is about 8465.3413989041. The cubic root of 71662005 is about 415.3647637316.

The spelling of 71662005 in words is "seventy-one million, six hundred sixty-two thousand, five".