81769716 has 48 divisors (see below), whose sum is σ = 242282880. Its totient is φ = 23362560.

The previous prime is 81769663. The next prime is 81769733. The reversal of 81769716 is 61796718.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53325 + ... + 54836.

It is an arithmetic number, because the mean of its divisors is an integer number (5047560).

Almost surely, 2^81769716 is an apocalyptic number.

It is an amenable number.

81769716 is an abundant number, since it is smaller than the sum of its proper divisors (160513164).

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

81769716 is a wasteful number, since it uses less digits than its factorization.

81769716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108181 (or 108173 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 81769716 is about 9042.6608915739. The cubic root of 81769716 is about 434.0410743545.

The spelling of 81769716 in words is "eighty-one million, seven hundred sixty-nine thousand, seven hundred sixteen".