81206260 has 12 divisors (see below), whose sum is σ = 170533188. Its totient is φ = 32482496.

The previous prime is 81206249. The next prime is 81206273. The reversal of 81206260 is 6260218.

It can be written as a sum of positive squares in 2 ways, for example, as 19395216 + 61811044 = 4404^2 + 7862^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2030137 + ... + 2030176.

It is an arithmetic number, because the mean of its divisors is an integer number (14211099).

Almost surely, 2^81206260 is an apocalyptic number.

It is an amenable number.

81206260 is an abundant number, since it is smaller than the sum of its proper divisors (89326928).

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

81206260 is a wasteful number, since it uses less digits than its factorization.

81206260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060322 (or 4060320 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 81206260 is about 9011.4516033767. The cubic root of 81206260 is about 433.0418170815.

Adding to 81206260 its reverse (6260218), we get a palindrome (87466478).

The spelling of 81206260 in words is "eighty-one million, two hundred six thousand, two hundred sixty".