81995032 has 96 divisors (see below), whose sum is σ = 191862000. Its totient is φ = 32659200.

The previous prime is 81995021. The next prime is 81995057. The reversal of 81995032 is 23059918.

It is a junction number, because it is equal to n+sod(n) for n = 81994982 and 81995000.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 752194 + ... + 752302.

Almost surely, 2^81995032 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 81995032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95931000).

81995032 is an abundant number, since it is smaller than the sum of its proper divisors (109866968).

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

81995032 is a wasteful number, since it uses less digits than its factorization.

81995032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 81995032 is about 9055.1108220717. The cubic root of 81995032 is about 434.4393746663.

It can be divided in two parts, 8199 and 5032, that added together give a palindrome (13231).

The spelling of 81995032 in words is "eighty-one million, nine hundred ninety-five thousand, thirty-two".