81677272 has 16 divisors (see below), whose sum is σ = 153358560. Its totient is φ = 40781664.

The previous prime is 81677263. The next prime is 81677287. The reversal of 81677272 is 27277618.

It is a super-2 number, since 2×81677272² = 13342353522723968, 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, 688 + ... + 12799.

It is an arithmetic number, because the mean of its divisors is an integer number (9584910).

Almost surely, 2^81677272 is an apocalyptic number.

It is an amenable number.

81677272 is a deficient number, since it is larger than the sum of its proper divisors (71681288).

81677272 is a wasteful number, since it uses less digits than its factorization.

81677272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14250 (or 14246 counting only the distinct ones).

The product of its digits is 65856, while the sum is 40.

The square root of 81677272 is about 9037.5478975218. The cubic root of 81677272 is about 433.8774456284.

The spelling of 81677272 in words is "eighty-one million, six hundred seventy-seven thousand, two hundred seventy-two".