81474224 has 60 divisors (see below), whose sum is σ = 176997600. Its totient is φ = 36271872.

The previous prime is 81474191. The next prime is 81474227. The reversal of 81474224 is 42247418.

It is not an unprimeable number, because it can be changed into a prime (81474227) 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 11 ways as a sum of consecutive naturals, for example, 77897 + ... + 78935.

It is an arithmetic number, because the mean of its divisors is an integer number (2949960).

Almost surely, 2^81474224 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 81474224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88498800).

81474224 is an abundant number, since it is smaller than the sum of its proper divisors (95523376).

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

81474224 is a wasteful number, since it uses less digits than its factorization.

81474224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102 (or 1083 counting only the distinct ones).

The product of its digits is 14336, while the sum is 32.

The square root of 81474224 is about 9026.3073291352. The cubic root of 81474224 is about 433.5176105130.

The spelling of 81474224 in words is "eighty-one million, four hundred seventy-four thousand, two hundred twenty-four".