81884454 has 16 divisors (see below), whose sum is σ = 169052160. Its totient is φ = 26414280.

The previous prime is 81884443. The next prime is 81884497. The reversal of 81884454 is 45448818.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 219934 + ... + 220305.

It is an arithmetic number, because the mean of its divisors is an integer number (10565760).

Almost surely, 2^81884454 is an apocalyptic number.

81884454 is an abundant number, since it is smaller than the sum of its proper divisors (87167706).

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

81884454 is a wasteful number, since it uses less digits than its factorization.

81884454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440275.

The product of its digits is 163840, while the sum is 42.

The square root of 81884454 is about 9049.0029284999. The cubic root of 81884454 is about 434.2439927128.

The spelling of 81884454 in words is "eighty-one million, eight hundred eighty-four thousand, four hundred fifty-four".