81568760 has 64 divisors (see below), whose sum is σ = 225892800. Its totient is φ = 25814016.

The previous prime is 81568727. The next prime is 81568763. The reversal of 81568760 is 6786518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81568763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7565 + ... + 14844.

It is an arithmetic number, because the mean of its divisors is an integer number (3529575).

Almost surely, 2^81568760 is an apocalyptic number.

It is an amenable number.

81568760 is an abundant number, since it is smaller than the sum of its proper divisors (144324040).

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

81568760 is a wasteful number, since it uses less digits than its factorization.

81568760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22440 (or 22436 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 81568760 is about 9031.5425039137. The cubic root of 81568760 is about 433.6852184505.

It can be divided in two parts, 81568 and 760, that added together give a palindrome (82328).

The spelling of 81568760 in words is "eighty-one million, five hundred sixty-eight thousand, seven hundred sixty".