71647543 has 4 divisors (see below), whose sum is σ = 78160968. Its totient is φ = 65134120.

The previous prime is 71647531. The next prime is 71647547. The reversal of 71647543 is 34574617.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71647543 - 2⁹ = 71647031 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 (71647547) 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 3 ways as a sum of consecutive naturals, for example, 3256696 + ... + 3256717.

It is an arithmetic number, because the mean of its divisors is an integer number (19540242).

Almost surely, 2^71647543 is an apocalyptic number.

71647543 is a deficient number, since it is larger than the sum of its proper divisors (6513425).

71647543 is a wasteful number, since it uses less digits than its factorization.

71647543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6513424.

The product of its digits is 70560, while the sum is 37.

The square root of 71647543 is about 8464.4871669818. The cubic root of 71647543 is about 415.3368204751.

The spelling of 71647543 in words is "seventy-one million, six hundred forty-seven thousand, five hundred forty-three".