81341808 has 20 divisors (see below), whose sum is σ = 210133128. Its totient is φ = 27113920.

The previous prime is 81341791. The next prime is 81341809. The reversal of 81341808 is 80814318.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81341809) 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 3 ways as a sum of consecutive naturals, for example, 847263 + ... + 847358.

Almost surely, 2^81341808 is an apocalyptic number.

It is an amenable number.

81341808 is an abundant number, since it is smaller than the sum of its proper divisors (128791320).

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

81341808 is a wasteful number, since it uses less digits than its factorization.

81341808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694632 (or 1694626 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 81341808 is about 9018.9693424471. The cubic root of 81341808 is about 433.2826249671.

The spelling of 81341808 in words is "eighty-one million, three hundred forty-one thousand, eight hundred eight".