81955016 has 64 divisors (see below), whose sum is σ = 183254400. Its totient is φ = 33868800.

The previous prime is 81954997. The next prime is 81955019. The reversal of 81955016 is 61055918.

It is not an unprimeable number, because it can be changed into a prime (81955019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80720 + ... + 81728.

It is an arithmetic number, because the mean of its divisors is an integer number (2863350).

Almost surely, 2^81955016 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 81955016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91627200).

81955016 is an abundant number, since it is smaller than the sum of its proper divisors (101299384).

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

81955016 is a wasteful number, since it uses less digits than its factorization.

81955016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110 (or 1106 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 81955016 is about 9052.9009715118. The cubic root of 81955016 is about 434.3686900797.

The spelling of 81955016 in words is "eighty-one million, nine hundred fifty-five thousand, sixteen".