81552210 has 32 divisors (see below), whose sum is σ = 196178112. Its totient is φ = 21696960.

The previous prime is 81552187. The next prime is 81552217. The reversal of 81552210 is 1225518.

It is not an unprimeable number, because it can be changed into a prime (81552217) 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, 11100 + ... + 16920.

It is an arithmetic number, because the mean of its divisors is an integer number (6130566).

Almost surely, 2^81552210 is an apocalyptic number.

81552210 is an abundant number, since it is smaller than the sum of its proper divisors (114625902).

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

81552210 is a wasteful number, since it uses less digits than its factorization.

81552210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6298.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 81552210 is about 9030.6262241331. The cubic root of 81552210 is about 433.6558854237.

Adding to 81552210 its reverse (1225518), we get a palindrome (82777728).

The spelling of 81552210 in words is "eighty-one million, five hundred fifty-two thousand, two hundred ten".