81350016 has 64 divisors (see below), whose sum is σ = 235742400. Its totient is φ = 24650240.

The previous prime is 81349991. The next prime is 81350033. The reversal of 81350016 is 61005318.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 5406 + ... + 13853.

It is an arithmetic number, because the mean of its divisors is an integer number (3683475).

Almost surely, 2^81350016 is an apocalyptic number.

It is an amenable number.

81350016 is an abundant number, since it is smaller than the sum of its proper divisors (154392384).

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

81350016 is a wasteful number, since it uses less digits than its factorization.

81350016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19287 (or 19275 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 81350016 is about 9019.4243718765. The cubic root of 81350016 is about 433.2971983018.

The spelling of 81350016 in words is "eighty-one million, three hundred fifty thousand, sixteen".