71666988 has 48 divisors (see below), whose sum is σ = 176257536. Its totient is φ = 22619520.

The previous prime is 71666981. The next prime is 71666999. The reversal of 71666988 is 88966617.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 71666988.

It is not an unprimeable number, because it can be changed into a prime (71666981) 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 15 ways as a sum of consecutive naturals, for example, 27168 + ... + 29688.

It is an arithmetic number, because the mean of its divisors is an integer number (3672032).

Almost surely, 2^71666988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71666988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88128768).

71666988 is an abundant number, since it is smaller than the sum of its proper divisors (104590548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71666988 is a wasteful number, since it uses less digits than its factorization.

71666988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654 (or 2652 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The square root of 71666988 is about 8465.6357115104. The cubic root of 71666988 is about 415.3743909375.

The spelling of 71666988 in words is "seventy-one million, six hundred sixty-six thousand, nine hundred eighty-eight".