81852216 has 64 divisors (see below), whose sum is σ = 216345600. Its totient is φ = 25753728.

The previous prime is 81852167. The next prime is 81852223. The reversal of 81852216 is 61225818.

It is a super-2 number, since 2×81852216² = 13399570528221312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42670 + ... + 44546.

It is an arithmetic number, because the mean of its divisors is an integer number (3380400).

Almost surely, 2^81852216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81852216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108172800).

81852216 is an abundant number, since it is smaller than the sum of its proper divisors (134493384).

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

81852216 is a wasteful number, since it uses less digits than its factorization.

81852216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988 (or 1984 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 81852216 is about 9047.2214519155. The cubic root of 81852216 is about 434.1869977859.

It can be divided in two parts, 8185 and 2216, that added together give a palindrome (10401).

The spelling of 81852216 in words is "eighty-one million, eight hundred fifty-two thousand, two hundred sixteen".