81444484 has 24 divisors (see below), whose sum is σ = 164632608. Its totient is φ = 34842240.

The previous prime is 81444479. The next prime is 81444509. The reversal of 81444484 is 48444418.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53694 + ... + 55189.

It is an arithmetic number, because the mean of its divisors is an integer number (6859692).

Almost surely, 2^81444484 is an apocalyptic number.

It is an amenable number.

81444484 is an abundant number, since it is smaller than the sum of its proper divisors (83188124).

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

81444484 is a wasteful number, since it uses less digits than its factorization.

81444484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108915 (or 108913 counting only the distinct ones).

The product of its digits is 65536, while the sum is 37.

The square root of 81444484 is about 9024.6597719803. The cubic root of 81444484 is about 433.4648560665.

The spelling of 81444484 in words is "eighty-one million, four hundred forty-four thousand, four hundred eighty-four".