81884858 has 8 divisors (see below), whose sum is σ = 133993440. Its totient is φ = 37220380.

The previous prime is 81884819. The next prime is 81884863. The reversal of 81884858 is 85848818.

It is a happy number.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1860998 + ... + 1861041.

It is an arithmetic number, because the mean of its divisors is an integer number (16749180).

Almost surely, 2^81884858 is an apocalyptic number.

81884858 is a deficient number, since it is larger than the sum of its proper divisors (52108582).

81884858 is a wasteful number, since it uses less digits than its factorization.

81884858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722052.

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

The square root of 81884858 is about 9049.0252513738. The cubic root of 81884858 is about 434.2447068666.

The spelling of 81884858 in words is "eighty-one million, eight hundred eighty-four thousand, eight hundred fifty-eight".