81255884 has 6 divisors (see below), whose sum is σ = 142197804. Its totient is φ = 40627940.

The previous prime is 81255877. The next prime is 81255899. The reversal of 81255884 is 48855218.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156982 + ... + 10156989.

It is an arithmetic number, because the mean of its divisors is an integer number (23699634).

Almost surely, 2^81255884 is an apocalyptic number.

It is an amenable number.

81255884 is a deficient number, since it is larger than the sum of its proper divisors (60941920).

81255884 is a wasteful number, since it uses less digits than its factorization.

81255884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20313975 (or 20313973 counting only the distinct ones).

The product of its digits is 102400, while the sum is 41.

The square root of 81255884 is about 9014.2045683466. The cubic root of 81255884 is about 433.1300077020.

The spelling of 81255884 in words is "eighty-one million, two hundred fifty-five thousand, eight hundred eighty-four".