71906447 has 8 divisors (see below), whose sum is σ = 76456512. Its totient is φ = 67392000.

The previous prime is 71906377. The next prime is 71906467. The reversal of 71906447 is 74460917.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71906447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71906447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71906467) 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, 4679 + ... + 12872.

It is an arithmetic number, because the mean of its divisors is an integer number (9557064).

Almost surely, 2^71906447 is an apocalyptic number.

71906447 is a deficient number, since it is larger than the sum of its proper divisors (4550065).

71906447 is a wasteful number, since it uses less digits than its factorization.

71906447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17809.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 71906447 is about 8479.7669189666. The cubic root of 71906447 is about 415.8365031046.

The spelling of 71906447 in words is "seventy-one million, nine hundred six thousand, four hundred forty-seven".