81835376 has 40 divisors (see below), whose sum is σ = 182175840. Its totient is φ = 34884864.

The previous prime is 81835373. The next prime is 81835387. The reversal of 81835376 is 67353818.

It is a super-2 number, since 2×81835376² = 13394057530122752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81835373) 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, 20210 + ... + 23918.

It is an arithmetic number, because the mean of its divisors is an integer number (4554396).

Almost surely, 2^81835376 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 81835376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91087920).

81835376 is an abundant number, since it is smaller than the sum of its proper divisors (100340464).

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

81835376 is a wasteful number, since it uses less digits than its factorization.

81835376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3921 (or 3915 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 81835376 is about 9046.2907315651. The cubic root of 81835376 is about 434.1572196855.

The spelling of 81835376 in words is "eighty-one million, eight hundred thirty-five thousand, three hundred seventy-six".