81801460 has 96 divisors (see below), whose sum is σ = 201801600. Its totient is φ = 27578880.

The previous prime is 81801449. The next prime is 81801463. The reversal of 81801460 is 6410818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81801463) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 142975 + ... + 143545.

It is an arithmetic number, because the mean of its divisors is an integer number (2102100).

Almost surely, 2^81801460 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81801460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100900800).

81801460 is an abundant number, since it is smaller than the sum of its proper divisors (120000140).

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

81801460 is a wasteful number, since it uses less digits than its factorization.

81801460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 81801460 is about 9044.4159568211. The cubic root of 81801460 is about 434.0972337656.

The spelling of 81801460 in words is "eighty-one million, eight hundred one thousand, four hundred sixty".