81760216 has 16 divisors (see below), whose sum is σ = 159966000. Its totient is φ = 39102624.

The previous prime is 81760201. The next prime is 81760247. The reversal of 81760216 is 61206718.

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 3 ways as a sum of consecutive naturals, for example, 221991 + ... + 222358.

It is an arithmetic number, because the mean of its divisors is an integer number (9997875).

Almost surely, 2^81760216 is an apocalyptic number.

It is an amenable number.

81760216 is a deficient number, since it is larger than the sum of its proper divisors (78205784).

81760216 is a wasteful number, since it uses less digits than its factorization.

81760216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444378 (or 444374 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 81760216 is about 9042.1355884548. The cubic root of 81760216 is about 434.0242647494.

The spelling of 81760216 in words is "eighty-one million, seven hundred sixty thousand, two hundred sixteen".