81734280 has 64 divisors (see below), whose sum is σ = 245851200. Its totient is φ = 21738240.

The previous prime is 81734273. The next prime is 81734281. The reversal of 81734280 is 8243718.

It is not an unprimeable number, because it can be changed into a prime (81734281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64291 + ... + 65549.

It is an arithmetic number, because the mean of its divisors is an integer number (3841425).

Almost surely, 2^81734280 is an apocalyptic number.

It is an amenable number.

81734280 is an abundant number, since it is smaller than the sum of its proper divisors (164116920).

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

81734280 is a wasteful number, since it uses less digits than its factorization.

81734280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814 (or 1810 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 81734280 is about 9040.7013002311. The cubic root of 81734280 is about 433.9783661270.

Adding to 81734280 its reverse (8243718), we get a palindrome (89977998).

The spelling of 81734280 in words is "eighty-one million, seven hundred thirty-four thousand, two hundred eighty".