81766622 has 8 divisors (see below), whose sum is σ = 140171376. Its totient is φ = 35042832.

The previous prime is 81766613. The next prime is 81766637. The reversal of 81766622 is 22666718.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 2920223 + ... + 2920250.

It is an arithmetic number, because the mean of its divisors is an integer number (17521422).

Almost surely, 2^81766622 is an apocalyptic number.

81766622 is a deficient number, since it is larger than the sum of its proper divisors (58404754).

81766622 is a wasteful number, since it uses less digits than its factorization.

81766622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5840482.

The product of its digits is 48384, while the sum is 38.

The square root of 81766622 is about 9042.4898119932. The cubic root of 81766622 is about 434.0355998745.

The spelling of 81766622 in words is "eighty-one million, seven hundred sixty-six thousand, six hundred twenty-two".