81330750 has 64 divisors (see below), whose sum is σ = 225576000. Its totient is φ = 21686400.

The previous prime is 81330749. The next prime is 81330791. The reversal of 81330750 is 5703318.

It is a super-3 number, since 3×81330750³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 726 + ... + 12774.

It is an arithmetic number, because the mean of its divisors is an integer number (3524625).

Almost surely, 2^81330750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81330750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112788000).

81330750 is an abundant number, since it is smaller than the sum of its proper divisors (144245250).

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

81330750 is a wasteful number, since it uses less digits than its factorization.

81330750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12075 (or 12059 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 81330750 is about 9018.3562803872. The cubic root of 81330750 is about 433.2629898966.

The spelling of 81330750 in words is "eighty-one million, three hundred thirty thousand, seven hundred fifty".