81333152 has 48 divisors (see below), whose sum is σ = 170009280. Its totient is φ = 38218752.

The previous prime is 81333103. The next prime is 81333163. The reversal of 81333152 is 25133318.

It is a super-2 number, since 2×81333152² = 13230163228510208, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42488 + ... + 44360.

It is an arithmetic number, because the mean of its divisors is an integer number (3541860).

Almost surely, 2^81333152 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 81333152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85004640).

81333152 is an abundant number, since it is smaller than the sum of its proper divisors (88676128).

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

81333152 is a wasteful number, since it uses less digits than its factorization.

81333152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965 (or 1957 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 81333152 is about 9018.4894522309. The cubic root of 81333152 is about 433.2672551446.

The spelling of 81333152 in words is "eighty-one million, three hundred thirty-three thousand, one hundred fifty-two".