81332532 has 24 divisors (see below), whose sum is σ = 210862400. Its totient is φ = 27110808.

The previous prime is 81332473. The next prime is 81332543. The reversal of 81332532 is 23523318.

It is a super-2 number, since 2×81332532² = 13229961523062048, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 81332496 and 81332505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376432 + ... + 376647.

Almost surely, 2^81332532 is an apocalyptic number.

It is an amenable number.

81332532 is an abundant number, since it is smaller than the sum of its proper divisors (129529868).

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

81332532 is a wasteful number, since it uses less digits than its factorization.

81332532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753092 (or 753084 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 81332532 is about 9018.4550783380. The cubic root of 81332532 is about 433.2661542144.

The spelling of 81332532 in words is "eighty-one million, three hundred thirty-two thousand, five hundred thirty-two".