71541666 has 72 divisors (see below), whose sum is σ = 186598620. Its totient is φ = 19728576.

The previous prime is 71541649. The next prime is 71541667. The reversal of 71541666 is 66614517.

It can be written as a sum of positive squares in 2 ways, for example, as 70207641 + 1334025 = 8379^2 + 1155^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71541666.

It is not an unprimeable number, because it can be changed into a prime (71541667) 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 35 ways as a sum of consecutive naturals, for example, 24180 + ... + 26976.

Almost surely, 2^71541666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71541666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93299310).

71541666 is an abundant number, since it is smaller than the sum of its proper divisors (115056954).

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

71541666 is a wasteful number, since it uses less digits than its factorization.

71541666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2848 (or 2838 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 71541666 is about 8458.2306660436. The cubic root of 71541666 is about 415.1321319232.

The spelling of 71541666 in words is "seventy-one million, five hundred forty-one thousand, six hundred sixty-six".