81950056 has 32 divisors (see below), whose sum is σ = 161676000. Its totient is φ = 38885056.

The previous prime is 81950053. The next prime is 81950101. The reversal of 81950056 is 65005918.

It is not an unprimeable number, because it can be changed into a prime (81950053) 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 7 ways as a sum of consecutive naturals, for example, 10695 + ... + 16681.

It is an arithmetic number, because the mean of its divisors is an integer number (5052375).

Almost surely, 2^81950056 is an apocalyptic number.

It is an amenable number.

81950056 is a deficient number, since it is larger than the sum of its proper divisors (79725944).

81950056 is a wasteful number, since it uses less digits than its factorization.

81950056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6081 (or 6077 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 81950056 is about 9052.6270220307. The cubic root of 81950056 is about 434.3599270929.

The spelling of 81950056 in words is "eighty-one million, nine hundred fifty thousand, fifty-six".