81860352 has 72 divisors (see below), whose sum is σ = 249008256. Its totient is φ = 23387136.

The previous prime is 81860351. The next prime is 81860357. The reversal of 81860352 is 25306818.

It is a happy number.

It is a super-2 number, since 2×81860352² = 13402234459127808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81860351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2238 + ... + 12989.

It is an arithmetic number, because the mean of its divisors is an integer number (3458448).

Almost surely, 2^81860352 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 81860352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124504128).

81860352 is an abundant number, since it is smaller than the sum of its proper divisors (167147904).

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

81860352 is a wasteful number, since it uses less digits than its factorization.

81860352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15253 (or 15239 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 81860352 is about 9047.6710815546. The cubic root of 81860352 is about 434.2013831769.

The spelling of 81860352 in words is "eighty-one million, eight hundred sixty thousand, three hundred fifty-two".