81444462 has 32 divisors (see below), whose sum is σ = 178018560. Its totient is φ = 24635520.

The previous prime is 81444439. The next prime is 81444479. The reversal of 81444462 is 26444418.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent 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 in 15 ways as a sum of consecutive naturals, for example, 65983 + ... + 67205.

It is an arithmetic number, because the mean of its divisors is an integer number (5563080).

Almost surely, 2^81444462 is an apocalyptic number.

81444462 is an abundant number, since it is smaller than the sum of its proper divisors (96574098).

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

81444462 is a wasteful number, since it uses less digits than its factorization.

81444462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2248.

The product of its digits is 24576, while the sum is 33.

The square root of 81444462 is about 9024.6585530977. The cubic root of 81444462 is about 433.4648170369.

The spelling of 81444462 in words is "eighty-one million, four hundred forty-four thousand, four hundred sixty-two".