81756848 has 20 divisors (see below), whose sum is σ = 166741560. Its totient is φ = 38726784.

The previous prime is 81756847. The next prime is 81756869. The reversal of 81756848 is 84865718.

It is a happy number.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (81756847) 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 3 ways as a sum of consecutive naturals, for example, 134165 + ... + 134772.

It is an arithmetic number, because the mean of its divisors is an integer number (8337078).

Almost surely, 2^81756848 is an apocalyptic number.

It is an amenable number.

81756848 is an abundant number, since it is smaller than the sum of its proper divisors (84984712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81756848 is a wasteful number, since it uses less digits than its factorization.

81756848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268964 (or 268958 counting only the distinct ones).

The product of its digits is 430080, while the sum is 47.

The square root of 81756848 is about 9041.9493473476. The cubic root of 81756848 is about 434.0183049894.

The spelling of 81756848 in words is "eighty-one million, seven hundred fifty-six thousand, eight hundred forty-eight".