81734272 has 32 divisors (see below), whose sum is σ = 169915680. Its totient is φ = 39088896.

The previous prime is 81734251. The next prime is 81734273. The reversal of 81734272 is 27243718.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (81734273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10938 + ... + 16825.

It is an arithmetic number, because the mean of its divisors is an integer number (5309865).

Almost surely, 2^81734272 is an apocalyptic number.

It is an amenable number.

81734272 is an abundant number, since it is smaller than the sum of its proper divisors (88181408).

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

81734272 is a wasteful number, since it uses less digits than its factorization.

81734272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27800 (or 27788 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 81734272 is about 9040.7008577875. The cubic root of 81734272 is about 433.9783519680.

The spelling of 81734272 in words is "eighty-one million, seven hundred thirty-four thousand, two hundred seventy-two".