71773866 has 48 divisors (see below), whose sum is σ = 161441280. Its totient is φ = 23021280.

The previous prime is 71773861. The next prime is 71773937. The reversal of 71773866 is 66837717.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (71773861) 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 23 ways as a sum of consecutive naturals, for example, 163275 + ... + 163713.

It is an arithmetic number, because the mean of its divisors is an integer number (3363360).

Almost surely, 2^71773866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71773866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80720640).

71773866 is an abundant number, since it is smaller than the sum of its proper divisors (89667414).

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

71773866 is a wasteful number, since it uses less digits than its factorization.

71773866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 768 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 71773866 is about 8471.9458213565. The cubic root of 71773866 is about 415.5807729599.

The spelling of 71773866 in words is "seventy-one million, seven hundred seventy-three thousand, eight hundred sixty-six".