81206760 has 64 divisors (see below), whose sum is σ = 256449600. Its totient is φ = 20514816.

The previous prime is 81206737. The next prime is 81206771. The reversal of 81206760 is 6760218.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15529 + ... + 20088.

It is an arithmetic number, because the mean of its divisors is an integer number (4007025).

Almost surely, 2^81206760 is an apocalyptic number.

It is an amenable number.

81206760 is an abundant number, since it is smaller than the sum of its proper divisors (175242840).

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

81206760 is a wasteful number, since it uses less digits than its factorization.

81206760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35650 (or 35646 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 81206760 is about 9011.4793458122. The cubic root of 81206760 is about 433.0427058491.

Adding to 81206760 its reverse (6760218), we get a palindrome (87966978).

The spelling of 81206760 in words is "eighty-one million, two hundred six thousand, seven hundred sixty".