81662938 has 8 divisors (see below), whose sum is σ = 139993632. Its totient is φ = 34998396.

The previous prime is 81662881. The next prime is 81662941. The reversal of 81662938 is 83926618.

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

It is a junction number, because it is equal to n+sod(n) for n = 81662894 and 81662903.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2916520 + ... + 2916547.

It is an arithmetic number, because the mean of its divisors is an integer number (17499204).

Almost surely, 2^81662938 is an apocalyptic number.

81662938 is a deficient number, since it is larger than the sum of its proper divisors (58330694).

81662938 is a wasteful number, since it uses less digits than its factorization.

81662938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5833076.

The product of its digits is 124416, while the sum is 43.

The square root of 81662938 is about 9036.7548378829. The cubic root of 81662938 is about 433.8520629526.

The spelling of 81662938 in words is "eighty-one million, six hundred sixty-two thousand, nine hundred thirty-eight".