81796884 has 48 divisors (see below), whose sum is σ = 206458560. Its totient is φ = 25056000.

The previous prime is 81796867. The next prime is 81796903. The reversal of 81796884 is 48869718.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38112 + ... + 40200.

It is an arithmetic number, because the mean of its divisors is an integer number (4301220).

Almost surely, 2^81796884 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 81796884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103229280).

81796884 is an abundant number, since it is smaller than the sum of its proper divisors (124661676).

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

81796884 is a wasteful number, since it uses less digits than its factorization.

81796884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360 (or 2358 counting only the distinct ones).

The product of its digits is 774144, while the sum is 51.

The square root of 81796884 is about 9044.1629795134. The cubic root of 81796884 is about 434.0891391016.

The spelling of 81796884 in words is "eighty-one million, seven hundred ninety-six thousand, eight hundred eighty-four".