81208260 has 72 divisors (see below), whose sum is σ = 281526336. Its totient is φ = 18561600.

The previous prime is 81208247. The next prime is 81208271. The reversal of 81208260 is 6280218.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 30966 + ... + 33485.

It is an arithmetic number, because the mean of its divisors is an integer number (3910088).

Almost surely, 2^81208260 is an apocalyptic number.

It is an amenable number.

81208260 is an abundant number, since it is smaller than the sum of its proper divisors (200318076).

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

81208260 is a wasteful number, since it uses less digits than its factorization.

81208260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64473 (or 64468 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 81208260 is about 9011.5625726064. The cubic root of 81208260 is about 433.0453721298.

Adding to 81208260 its reverse (6280218), we get a palindrome (87488478).

The spelling of 81208260 in words is "eighty-one million, two hundred eight thousand, two hundred sixty".