71500805 has 8 divisors (see below), whose sum is σ = 88759800. Its totient is φ = 55228096.

The previous prime is 71500777. The next prime is 71500817. The reversal of 71500805 is 50800517.

It can be written as a sum of positive squares in 4 ways, for example, as 148996 + 71351809 = 386^2 + 8447^2 .

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 71500805 - 2²⁰ = 70452229 is a prime.

It is a super-2 number, since 2×71500805² = 10224730231296050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246410 + ... + 246699.

It is an arithmetic number, because the mean of its divisors is an integer number (11094975).

Almost surely, 2^71500805 is an apocalyptic number.

It is an amenable number.

71500805 is a deficient number, since it is larger than the sum of its proper divisors (17258995).

71500805 is a wasteful number, since it uses less digits than its factorization.

71500805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493143.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 71500805 is about 8455.8148631578. The cubic root of 71500805 is about 415.0530826762.

The spelling of 71500805 in words is "seventy-one million, five hundred thousand, eight hundred five".