81552318 has 8 divisors (see below), whose sum is σ = 163104648. Its totient is φ = 27184104.

The previous prime is 81552311. The next prime is 81552353. The reversal of 81552318 is 81325518.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

81552318 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81552311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6796021 + ... + 6796032.

It is an arithmetic number, because the mean of its divisors is an integer number (20388081).

Almost surely, 2^81552318 is an apocalyptic number.

81552318 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81552318 is a wasteful number, since it uses less digits than its factorization.

81552318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13592058.

The product of its digits is 9600, while the sum is 33.

The square root of 81552318 is about 9030.6322037829. The cubic root of 81552318 is about 433.6560768545.

The spelling of 81552318 in words is "eighty-one million, five hundred fifty-two thousand, three hundred eighteen".