81354336 has 48 divisors (see below), whose sum is σ = 244065024. Its totient is φ = 23243904.

The previous prime is 81354331. The next prime is 81354353. The reversal of 81354336 is 63345318.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 81354297 and 81354306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81354331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59860 + ... + 61203.

It is an arithmetic number, because the mean of its divisors is an integer number (5084688).

Almost surely, 2^81354336 is an apocalyptic number.

It is an amenable number.

81354336 is an abundant number, since it is smaller than the sum of its proper divisors (162710688).

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

81354336 is a wasteful number, since it uses less digits than its factorization.

81354336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121083 (or 121075 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 81354336 is about 9019.6638518295. The cubic root of 81354336 is about 433.3048680842.

The spelling of 81354336 in words is "eighty-one million, three hundred fifty-four thousand, three hundred thirty-six".