81862732 has 72 divisors (see below), whose sum is σ = 174551328. Its totient is φ = 33465600.

The previous prime is 81862721. The next prime is 81862733. The reversal of 81862732 is 23726818.

It is a junction number, because it is equal to n+sod(n) for n = 81862691 and 81862700.

It is not an unprimeable number, because it can be changed into a prime (81862733) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 490113 + ... + 490279.

It is an arithmetic number, because the mean of its divisors is an integer number (2424324).

Almost surely, 2^81862732 is an apocalyptic number.

81862732 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81862732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87275664).

81862732 is an abundant number, since it is smaller than the sum of its proper divisors (92688596).

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

81862732 is a wasteful number, since it uses less digits than its factorization.

81862732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 278 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 81862732 is about 9047.8026061580. The cubic root of 81862732 is about 434.2055911125.

The spelling of 81862732 in words is "eighty-one million, eight hundred sixty-two thousand, seven hundred thirty-two".