81338487 has 8 divisors (see below), whose sum is σ = 114159360. Its totient is φ = 51371640.

The previous prime is 81338483. The next prime is 81338501. The reversal of 81338487 is 78483318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81338487 - 2² = 81338483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81338483) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 713439 + ... + 713552.

It is an arithmetic number, because the mean of its divisors is an integer number (14269920).

Almost surely, 2^81338487 is an apocalyptic number.

81338487 is a deficient number, since it is larger than the sum of its proper divisors (32820873).

81338487 is a wasteful number, since it uses less digits than its factorization.

81338487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427013.

The product of its digits is 129024, while the sum is 42.

The square root of 81338487 is about 9018.7852286214. The cubic root of 81338487 is about 433.2767282406.

The spelling of 81338487 in words is "eighty-one million, three hundred thirty-eight thousand, four hundred eighty-seven".