81888485 has 8 divisors (see below), whose sum is σ = 112304256. Its totient is φ = 56152080.

The previous prime is 81888481. The next prime is 81888497. The reversal of 81888485 is 58488818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81888485 - 2² = 81888481 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81888481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1169801 + ... + 1169870.

It is an arithmetic number, because the mean of its divisors is an integer number (14038032).

Almost surely, 2^81888485 is an apocalyptic number.

It is an amenable number.

81888485 is a deficient number, since it is larger than the sum of its proper divisors (30415771).

81888485 is a wasteful number, since it uses less digits than its factorization.

81888485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339683.

The product of its digits is 655360, while the sum is 50.

The square root of 81888485 is about 9049.2256574803. The cubic root of 81888485 is about 434.2511182363.

The spelling of 81888485 in words is "eighty-one million, eight hundred eighty-eight thousand, four hundred eighty-five".