71706561 has 8 divisors (see below), whose sum is σ = 101232864. Its totient is φ = 44992320.

The previous prime is 71706553. The next prime is 71706563. The reversal of 71706561 is 16560717.

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

It is not a de Polignac number, because 71706561 - 2³ = 71706553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71706563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702955 + ... + 703056.

It is an arithmetic number, because the mean of its divisors is an integer number (12654108).

Almost surely, 2^71706561 is an apocalyptic number.

It is an amenable number.

71706561 is a deficient number, since it is larger than the sum of its proper divisors (29526303).

71706561 is a wasteful number, since it uses less digits than its factorization.

71706561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406031.

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 71706561 is about 8467.9726617414. The cubic root of 71706561 is about 415.4508305306.

It can be divided in two parts, 7170 and 6561, that added together give a palindrome (13731).

The spelling of 71706561 in words is "seventy-one million, seven hundred six thousand, five hundred sixty-one".