81033760 has 24 divisors (see below), whose sum is σ = 191442636. Its totient is φ = 32413440.

The previous prime is 81033739. The next prime is 81033773. The reversal of 81033760 is 6733018.

It can be written as a sum of positive squares in 2 ways, for example, as 78925456 + 2108304 = 8884^2 + 1452^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253071 + ... + 253390.

Almost surely, 2^81033760 is an apocalyptic number.

81033760 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81033760 is an abundant number, since it is smaller than the sum of its proper divisors (110408876).

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

81033760 is a wasteful number, since it uses less digits than its factorization.

81033760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506476 (or 506468 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 81033760 is about 9001.8753601680. The cubic root of 81033760 is about 432.7349742805.

Adding to 81033760 its reverse (6733018), we get a palindrome (87766778).

The spelling of 81033760 in words is "eighty-one million, thirty-three thousand, seven hundred sixty".