81362005 has 8 divisors (see below), whose sum is σ = 97790112. Its totient is φ = 64985808.

The previous prime is 81361997. The next prime is 81362027. The reversal of 81362005 is 50026318.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81362005 - 2³ = 81361997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9439 + ... + 15868.

It is an arithmetic number, because the mean of its divisors is an integer number (12223764).

Almost surely, 2^81362005 is an apocalyptic number.

It is an amenable number.

81362005 is a deficient number, since it is larger than the sum of its proper divisors (16428107).

81362005 is a wasteful number, since it uses less digits than its factorization.

81362005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25955.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 81362005 is about 9020.0889685191. The cubic root of 81362005 is about 433.3184830545.

The spelling of 81362005 in words is "eighty-one million, three hundred sixty-two thousand, five".