71988646 has 8 divisors (see below), whose sum is σ = 108698544. Its totient is φ = 35755800.

The previous prime is 71988641. The next prime is 71988649. The reversal of 71988646 is 64688917.

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

It is a self number, because there is not a number n which added to its sum of digits gives 71988646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71988641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118885 + ... + 119488.

It is an arithmetic number, because the mean of its divisors is an integer number (13587318).

Almost surely, 2^71988646 is an apocalyptic number.

71988646 is a deficient number, since it is larger than the sum of its proper divisors (36709898).

71988646 is a wasteful number, since it uses less digits than its factorization.

71988646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238526.

The product of its digits is 580608, while the sum is 49.

The square root of 71988646 is about 8484.6123069944. The cubic root of 71988646 is about 415.9948956166.

The spelling of 71988646 in words is "seventy-one million, nine hundred eighty-eight thousand, six hundred forty-six".