81351952 has 40 divisors (see below), whose sum is σ = 174051360. Its totient is φ = 36526080.

The previous prime is 81351947. The next prime is 81351983. The reversal of 81351952 is 25915318.

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, 11824 + ... + 17392.

It is an arithmetic number, because the mean of its divisors is an integer number (4351284).

Almost surely, 2^81351952 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 81351952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87025680).

81351952 is an abundant number, since it is smaller than the sum of its proper divisors (92699408).

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

81351952 is a wasteful number, since it uses less digits than its factorization.

81351952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5671 (or 5665 counting only the distinct ones).

The product of its digits is 10800, while the sum is 34.

The square root of 81351952 is about 9019.5316951602. The cubic root of 81351952 is about 433.3006355341.

The spelling of 81351952 in words is "eighty-one million, three hundred fifty-one thousand, nine hundred fifty-two".