81924272 has 10 divisors (see below), whose sum is σ = 158728308. Its totient is φ = 40962128.

The previous prime is 81924259. The next prime is 81924301. The reversal of 81924272 is 27242918.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2560118 + ... + 2560149.

Almost surely, 2^81924272 is an apocalyptic number.

It is an amenable number.

81924272 is a deficient number, since it is larger than the sum of its proper divisors (76804036).

81924272 is a wasteful number, since it uses less digits than its factorization.

81924272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120275 (or 5120269 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 81924272 is about 9051.2027929994. The cubic root of 81924272 is about 434.3143679980.

The spelling of 81924272 in words is "eighty-one million, nine hundred twenty-four thousand, two hundred seventy-two".