71712805 has 8 divisors (see below), whose sum is σ = 86317344. Its totient is φ = 57195600.

The previous prime is 71712761. The next prime is 71712811. The reversal of 71712805 is 50821717.

It is a happy number.

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

It is not a de Polignac number, because 71712805 - 2⁹ = 71712293 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, 20011 + ... + 23320.

It is an arithmetic number, because the mean of its divisors is an integer number (10789668).

Almost surely, 2^71712805 is an apocalyptic number.

It is an amenable number.

71712805 is a deficient number, since it is larger than the sum of its proper divisors (14604539).

71712805 is a wasteful number, since it uses less digits than its factorization.

71712805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43667.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 71712805 is about 8468.3413370034. The cubic root of 71712805 is about 415.4628889330.

The spelling of 71712805 in words is "seventy-one million, seven hundred twelve thousand, eight hundred five".