81750132 has 18 divisors (see below), whose sum is σ = 206646258. Its totient is φ = 27250032.

The previous prime is 81750091. The next prime is 81750133. The reversal of 81750132 is 23105718.

It can be written as a sum of positive squares in only one way, i.e., 71978256 + 9771876 = 8484^2 + 3126^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 81750096 and 81750105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81750133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1135383 + ... + 1135454.

Almost surely, 2^81750132 is an apocalyptic number.

It is an amenable number.

81750132 is an abundant number, since it is smaller than the sum of its proper divisors (124896126).

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

81750132 is a wasteful number, since it uses less digits than its factorization.

81750132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270847 (or 2270842 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 81750132 is about 9041.5779596263. The cubic root of 81750132 is about 434.0064203712.

The spelling of 81750132 in words is "eighty-one million, seven hundred fifty thousand, one hundred thirty-two".