81768488 has 16 divisors (see below), whose sum is σ = 153473280. Its totient is φ = 40842288.

The previous prime is 81768481. The next prime is 81768509. The reversal of 81768488 is 88486718.

It is a super-3 number, since 3×81768488³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (81768481) 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, 3995 + ... + 13397.

It is an arithmetic number, because the mean of its divisors is an integer number (9592080).

Almost surely, 2^81768488 is an apocalyptic number.

It is an amenable number.

81768488 is a deficient number, since it is larger than the sum of its proper divisors (71704792).

81768488 is a wasteful number, since it uses less digits than its factorization.

81768488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10496 (or 10492 counting only the distinct ones).

The product of its digits is 688128, while the sum is 50.

The square root of 81768488 is about 9042.5929909512. The cubic root of 81768488 is about 434.0389015651.

The spelling of 81768488 in words is "eighty-one million, seven hundred sixty-eight thousand, four hundred eighty-eight".