81748292 has 12 divisors (see below), whose sum is σ = 143129280. Its totient is φ = 40854216.

The previous prime is 81748273. The next prime is 81748309. The reversal of 81748292 is 29284718.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8009 + ... + 15087.

It is an arithmetic number, because the mean of its divisors is an integer number (11927440).

Almost surely, 2^81748292 is an apocalyptic number.

It is an amenable number.

81748292 is a deficient number, since it is larger than the sum of its proper divisors (61380988).

81748292 is a wasteful number, since it uses less digits than its factorization.

81748292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9970 (or 9968 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 81748292 is about 9041.4762069034. The cubic root of 81748292 is about 434.0031641979.

The spelling of 81748292 in words is "eighty-one million, seven hundred forty-eight thousand, two hundred ninety-two".