81750912 has 64 divisors (see below), whose sum is σ = 222245760. Its totient is φ = 26611200.

The previous prime is 81750899. The next prime is 81750941. The reversal of 81750912 is 21905718.

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

It is a super-3 number, since 3×81750912³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14037 + ... + 18987.

It is an arithmetic number, because the mean of its divisors is an integer number (3472590).

Almost surely, 2^81750912 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 81750912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111122880).

81750912 is an abundant number, since it is smaller than the sum of its proper divisors (140494848).

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

81750912 is a wasteful number, since it uses less digits than its factorization.

81750912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011 (or 4999 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 81750912 is about 9041.6210935871. The cubic root of 81750912 is about 434.0078006908.

The spelling of 81750912 in words is "eighty-one million, seven hundred fifty thousand, nine hundred twelve".