81758132 has 12 divisors (see below), whose sum is σ = 144107040. Its totient is φ = 40584696.

The previous prime is 81758119. The next prime is 81758137. The reversal of 81758132 is 23185718.

It is a junction number, because it is equal to n+sod(n) for n = 81758092 and 81758101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81758137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72968 + ... + 74079.

It is an arithmetic number, because the mean of its divisors is an integer number (12008920).

Almost surely, 2^81758132 is an apocalyptic number.

It is an amenable number.

81758132 is a deficient number, since it is larger than the sum of its proper divisors (62348908).

81758132 is a wasteful number, since it uses less digits than its factorization.

81758132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147190 (or 147188 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 81758132 is about 9042.0203494573. The cubic root of 81758132 is about 434.0205770787.

The spelling of 81758132 in words is "eighty-one million, seven hundred fifty-eight thousand, one hundred thirty-two".