81654984 has 48 divisors (see below), whose sum is σ = 222505920. Its totient is φ = 27051360.

The previous prime is 81654971. The next prime is 81655003. The reversal of 81654984 is 48945618.

It is a super-3 number, since 3×81654984³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8629 + ... + 15419.

It is an arithmetic number, because the mean of its divisors is an integer number (4635540).

Almost surely, 2^81654984 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 81654984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111252960).

81654984 is an abundant number, since it is smaller than the sum of its proper divisors (140850936).

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

81654984 is a wasteful number, since it uses less digits than its factorization.

81654984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6970 (or 6963 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 81654984 is about 9036.3147355545. The cubic root of 81654984 is about 433.8379767121.

The spelling of 81654984 in words is "eighty-one million, six hundred fifty-four thousand, nine hundred eighty-four".