81750942 has 96 divisors (see below), whose sum is σ = 225650880. Its totient is φ = 20805120.

The previous prime is 81750941. The next prime is 81750953. The reversal of 81750942 is 24905718.

It is a junction number, because it is equal to n+sod(n) for n = 81750897 and 81750906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81750941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46642 + ... + 48362.

It is an arithmetic number, because the mean of its divisors is an integer number (2350530).

Almost surely, 2^81750942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81750942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112825440).

81750942 is an abundant number, since it is smaller than the sum of its proper divisors (143899938).

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

81750942 is a wasteful number, since it uses less digits than its factorization.

81750942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778 (or 1775 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 81750942 is about 9041.6227525815. The cubic root of 81750942 is about 434.0078537799.

The spelling of 81750942 in words is "eighty-one million, seven hundred fifty thousand, nine hundred forty-two".