81654412 has 48 divisors (see below), whose sum is σ = 168920640. Its totient is φ = 33806592.

The previous prime is 81654389. The next prime is 81654431. The reversal of 81654412 is 21445618.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278538 + ... + 278830.

It is an arithmetic number, because the mean of its divisors is an integer number (3519180).

Almost surely, 2^81654412 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 81654412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84460320).

81654412 is an abundant number, since it is smaller than the sum of its proper divisors (87266228).

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

81654412 is a wasteful number, since it uses less digits than its factorization.

81654412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610 (or 608 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 81654412 is about 9036.2830854284. The cubic root of 81654412 is about 433.8369636859.

The spelling of 81654412 in words is "eighty-one million, six hundred fifty-four thousand, four hundred twelve".