81889102 has 8 divisors (see below), whose sum is σ = 130059216. Its totient is φ = 38536032.

The previous prime is 81889091. The next prime is 81889111. The reversal of 81889102 is 20198818.

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

It is a congruent number.

It is an unprimeable number.

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, 1204218 + ... + 1204285.

It is an arithmetic number, because the mean of its divisors is an integer number (16257402).

Almost surely, 2^81889102 is an apocalyptic number.

81889102 is a deficient number, since it is larger than the sum of its proper divisors (48170114).

81889102 is a wasteful number, since it uses less digits than its factorization.

81889102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408522.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 81889102 is about 9049.2597487308. The cubic root of 81889102 is about 434.2522088751.

The spelling of 81889102 in words is "eighty-one million, eight hundred eighty-nine thousand, one hundred two".