81932272 has 40 divisors (see below), whose sum is σ = 162862592. Its totient is φ = 39916800.

The previous prime is 81932267. The next prime is 81932273. The reversal of 81932272 is 27223918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81932273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123622 + ... + 124282.

Almost surely, 2^81932272 is an apocalyptic number.

It is an amenable number.

81932272 is a deficient number, since it is larger than the sum of its proper divisors (80930320).

81932272 is a wasteful number, since it uses less digits than its factorization.

81932272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857 (or 851 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 81932272 is about 9051.6447124266. The cubic root of 81932272 is about 434.3285046381.

The spelling of 81932272 in words is "eighty-one million, nine hundred thirty-two thousand, two hundred seventy-two".