81524296 has 64 divisors (see below), whose sum is σ = 182108160. Its totient is φ = 33480000.

The previous prime is 81524257. The next prime is 81524309. The reversal of 81524296 is 69242518.

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, 261981 + ... + 262291.

It is an arithmetic number, because the mean of its divisors is an integer number (2845440).

Almost surely, 2^81524296 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 81524296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91054080).

81524296 is an abundant number, since it is smaller than the sum of its proper divisors (100583864).

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

81524296 is a wasteful number, since it uses less digits than its factorization.

81524296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 502 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 81524296 is about 9029.0805733474. The cubic root of 81524296 is about 433.6064019833.

The spelling of 81524296 in words is "eighty-one million, five hundred twenty-four thousand, two hundred ninety-six".