81654356 has 24 divisors (see below), whose sum is σ = 165989376. Its totient is φ = 34420320.

The previous prime is 81654323. The next prime is 81654371. The reversal of 81654356 is 65345618.

81654356 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

81654356 is strictly pandigital in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22196 + ... + 25611.

It is an arithmetic number, because the mean of its divisors is an integer number (6916224).

Almost surely, 2^81654356 is an apocalyptic number.

It is an amenable number.

81654356 is an abundant number, since it is smaller than the sum of its proper divisors (84335020).

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

81654356 is a wasteful number, since it uses less digits than its factorization.

81654356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47879 (or 47877 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

The square root of 81654356 is about 9036.2799868087. The cubic root of 81654356 is about 433.8368645083.

It can be divided in two parts, 8165 and 4356, that added together give a palindrome (12521).

The spelling of 81654356 in words is "eighty-one million, six hundred fifty-four thousand, three hundred fifty-six".