81582496 has 12 divisors (see below), whose sum is σ = 160615602. Its totient is φ = 40791232.

The previous prime is 81582493. The next prime is 81582499. The reversal of 81582496 is 69428518.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81582493) and next prime (81582499).

It can be written as a sum of positive squares in only one way, i.e., 71571600 + 10010896 = 8460^2 + 3164^2 .

It is not an unprimeable number, because it can be changed into a prime (81582491) 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 as a sum of consecutive naturals, namely, 1274695 + ... + 1274758.

Almost surely, 2^81582496 is an apocalyptic number.

It is an amenable number.

81582496 is a deficient number, since it is larger than the sum of its proper divisors (79033106).

81582496 is a wasteful number, since it uses less digits than its factorization.

81582496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549463 (or 2549455 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 81582496 is about 9032.3029178610. The cubic root of 81582496 is about 433.7095609635.

The spelling of 81582496 in words is "eighty-one million, five hundred eighty-two thousand, four hundred ninety-six".