81648296 has 32 divisors (see below), whose sum is σ = 160289280. Its totient is φ = 38942400.

The previous prime is 81648257. The next prime is 81648313. The reversal of 81648296 is 69284618.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15290 + ... + 19926.

It is an arithmetic number, because the mean of its divisors is an integer number (5009040).

Almost surely, 2^81648296 is an apocalyptic number.

It is an amenable number.

81648296 is a deficient number, since it is larger than the sum of its proper divisors (78640984).

81648296 is a wasteful number, since it uses less digits than its factorization.

81648296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4745 (or 4741 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 81648296 is about 9035.9446656119. The cubic root of 81648296 is about 433.8261318029.

The spelling of 81648296 in words is "eighty-one million, six hundred forty-eight thousand, two hundred ninety-six".