81383584 has 12 divisors (see below), whose sum is σ = 160223994. Its totient is φ = 40691776.

The previous prime is 81383581. The next prime is 81383611. The reversal of 81383584 is 48538318.

It can be written as a sum of positive squares in only one way, i.e., 43191184 + 38192400 = 6572^2 + 6180^2 .

It is not an unprimeable number, because it can be changed into a prime (81383581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271587 + ... + 1271650.

Almost surely, 2^81383584 is an apocalyptic number.

It is an amenable number.

81383584 is a deficient number, since it is larger than the sum of its proper divisors (78840410).

81383584 is a wasteful number, since it uses less digits than its factorization.

81383584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543247 (or 2543239 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The square root of 81383584 is about 9021.2850525854. The cubic root of 81383584 is about 433.3567882110.

The spelling of 81383584 in words is "eighty-one million, three hundred eighty-three thousand, five hundred eighty-four".