81368484 has 12 divisors (see below), whose sum is σ = 189859824. Its totient is φ = 27122824.

The previous prime is 81368479. The next prime is 81368491. The reversal of 81368484 is 48486318.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

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 3 ways as a sum of consecutive naturals, for example, 3390342 + ... + 3390365.

It is an arithmetic number, because the mean of its divisors is an integer number (15821652).

Almost surely, 2^81368484 is an apocalyptic number.

It is an amenable number.

81368484 is an abundant number, since it is smaller than the sum of its proper divisors (108491340).

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

81368484 is a wasteful number, since it uses less digits than its factorization.

81368484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780714 (or 6780712 counting only the distinct ones).

The product of its digits is 147456, while the sum is 42.

The square root of 81368484 is about 9020.4481041687. The cubic root of 81368484 is about 433.3299847210.

The spelling of 81368484 in words is "eighty-one million, three hundred sixty-eight thousand, four hundred eighty-four".