81950016 has 56 divisors (see below), whose sum is σ = 218907360. Its totient is φ = 27054592.

The previous prime is 81950003. The next prime is 81950039. The reversal of 81950016 is 61005918.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18550 + ... + 22538.

It is an arithmetic number, because the mean of its divisors is an integer number (3909060).

Almost surely, 2^81950016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81950016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109453680).

81950016 is an abundant number, since it is smaller than the sum of its proper divisors (136957344).

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

81950016 is a wasteful number, since it uses less digits than its factorization.

81950016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4111 (or 4101 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 81950016 is about 9052.6248127270. The cubic root of 81950016 is about 434.3598564222.

The spelling of 81950016 in words is "eighty-one million, nine hundred fifty thousand, sixteen".