71540647 has 8 divisors (see below), whose sum is σ = 73634576. Its totient is φ = 69455232.

The previous prime is 71540611. The next prime is 71540669. The reversal of 71540647 is 74604517.

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 71540647 - 2¹⁹ = 71016359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71541647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17503 + ... + 21199.

It is an arithmetic number, because the mean of its divisors is an integer number (9204322).

Almost surely, 2^71540647 is an apocalyptic number.

71540647 is a deficient number, since it is larger than the sum of its proper divisors (2093929).

71540647 is a wasteful number, since it uses less digits than its factorization.

71540647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4257.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 71540647 is about 8458.1704286447. The cubic root of 71540647 is about 415.1301609429.

The spelling of 71540647 in words is "seventy-one million, five hundred forty thousand, six hundred forty-seven".