81842272 has 24 divisors (see below), whose sum is σ = 169608600. Its totient is φ = 38767104.

The previous prime is 81842251. The next prime is 81842281. The reversal of 81842272 is 27224818.

It is a super-2 number, since 2×81842272² = 13396314972243968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66697 + ... + 67912.

It is an arithmetic number, because the mean of its divisors is an integer number (7067025).

Almost surely, 2^81842272 is an apocalyptic number.

It is an amenable number.

81842272 is an abundant number, since it is smaller than the sum of its proper divisors (87766328).

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

81842272 is a wasteful number, since it uses less digits than its factorization.

81842272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134638 (or 134630 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 81842272 is about 9046.6718742309. The cubic root of 81842272 is about 434.1694143469.

The spelling of 81842272 in words is "eighty-one million, eight hundred forty-two thousand, two hundred seventy-two".