81717752 has 16 divisors (see below), whose sum is σ = 153316800. Its totient is φ = 40833280.

The previous prime is 81717751. The next prime is 81717763. The reversal of 81717752 is 25771718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81717751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22649 + ... + 26007.

It is an arithmetic number, because the mean of its divisors is an integer number (9582300).

Almost surely, 2^81717752 is an apocalyptic number.

It is an amenable number.

81717752 is a deficient number, since it is larger than the sum of its proper divisors (71599048).

81717752 is a wasteful number, since it uses less digits than its factorization.

81717752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6406 (or 6402 counting only the distinct ones).

The product of its digits is 27440, while the sum is 38.

The square root of 81717752 is about 9039.7871656361. The cubic root of 81717752 is about 433.9491116617.

The spelling of 81717752 in words is "eighty-one million, seven hundred seventeen thousand, seven hundred fifty-two".