81842196 has 48 divisors (see below), whose sum is σ = 201723200. Its totient is φ = 25754112.

The previous prime is 81842179. The next prime is 81842213. The reversal of 81842196 is 69124818.

It is an interprime number because it is at equal distance from previous prime (81842179) and next prime (81842213).

It is a super-2 number, since 2×81842196² = 13396290092204832, 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, 98310 + ... + 99138.

Almost surely, 2^81842196 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 81842196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100861600).

81842196 is an abundant number, since it is smaller than the sum of its proper divisors (119881004).

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

81842196 is a wasteful number, since it uses less digits than its factorization.

81842196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288 (or 1286 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 81842196 is about 9046.6676737902. The cubic root of 81842196 is about 434.1692799547.

The spelling of 81842196 in words is "eighty-one million, eight hundred forty-two thousand, one hundred ninety-six".