81555468 has 24 divisors (see below), whose sum is σ = 192591168. Its totient is φ = 26857296.

The previous prime is 81555457. The next prime is 81555469. The reversal of 81555468 is 86455518.

It is not an unprimeable number, because it can be changed into a prime (81555469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39946 + ... + 41937.

It is an arithmetic number, because the mean of its divisors is an integer number (8024632).

Almost surely, 2^81555468 is an apocalyptic number.

It is an amenable number.

81555468 is an abundant number, since it is smaller than the sum of its proper divisors (111035700).

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

81555468 is a wasteful number, since it uses less digits than its factorization.

81555468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81973 (or 81971 counting only the distinct ones).

The product of its digits is 192000, while the sum is 42.

The square root of 81555468 is about 9030.8066084930. The cubic root of 81555468 is about 433.6616601786.

The spelling of 81555468 in words is "eighty-one million, five hundred fifty-five thousand, four hundred sixty-eight".