81895484 has 12 divisors (see below), whose sum is σ = 156346008. Its totient is φ = 37225200.

The previous prime is 81895427. The next prime is 81895487. The reversal of 81895484 is 48459818.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81895487) 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 3 ways as a sum of consecutive naturals, for example, 930587 + ... + 930674.

It is an arithmetic number, because the mean of its divisors is an integer number (13028834).

Almost surely, 2^81895484 is an apocalyptic number.

It is an amenable number.

81895484 is a deficient number, since it is larger than the sum of its proper divisors (74450524).

81895484 is a wasteful number, since it uses less digits than its factorization.

81895484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861276 (or 1861274 counting only the distinct ones).

The product of its digits is 368640, while the sum is 47.

The square root of 81895484 is about 9049.6123673890. The cubic root of 81895484 is about 434.2634896827.

The spelling of 81895484 in words is "eighty-one million, eight hundred ninety-five thousand, four hundred eighty-four".