81396484 has 27 divisors (see below), whose sum is σ = 154689717. Its totient is φ = 37459344.

The previous prime is 81396473. The next prime is 81396503. The reversal of 81396484 is 48469318.

The square root of 81396484 is 9022.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 12040900 + 69355584 = 3470^2 + 8328^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81396484.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 234399 + ... + 234745.

Almost surely, 2^81396484 is an apocalyptic number.

81396484 is the 9022-nd square number.

It is an amenable number.

81396484 is a deficient number, since it is larger than the sum of its proper divisors (73293233).

81396484 is a wasteful number, since it uses less digits than its factorization.

81396484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724 (or 362 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The cubic root of 81396484 is about 433.3796839309.

The spelling of 81396484 in words is "eighty-one million, three hundred ninety-six thousand, four hundred eighty-four".