81280210 has 32 divisors (see below), whose sum is σ = 161092800. Its totient is φ = 29280960.

The previous prime is 81280201. The next prime is 81280211. The reversal of 81280210 is 1208218.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (81280211) 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 15 ways as a sum of consecutive naturals, for example, 8601 + ... + 15379.

It is an arithmetic number, because the mean of its divisors is an integer number (5034150).

Almost surely, 2^81280210 is an apocalyptic number.

81280210 is a deficient number, since it is larger than the sum of its proper divisors (79812590).

81280210 is a wasteful number, since it uses less digits than its factorization.

81280210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6906.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 81280210 is about 9015.5537822144. The cubic root of 81280210 is about 433.1732261898.

Adding to 81280210 its reverse (1208218), we get a palindrome (82488428).

The spelling of 81280210 in words is "eighty-one million, two hundred eighty thousand, two hundred ten".