81022752 has 144 divisors (see below), whose sum is σ = 243243000. Its totient is φ = 25546752.

The previous prime is 81022741. The next prime is 81022763. The reversal of 81022752 is 25722018.

It is an interprime number because it is at equal distance from previous prime (81022741) and next prime (81022763).

It can be written as a sum of positive squares in 4 ways, for example, as 65999376 + 15023376 = 8124^2 + 3876^2 .

It is a tau number, because it is divible by the number of its divisors (144).

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, 743274 + ... + 743382.

Almost surely, 2^81022752 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 81022752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121621500).

81022752 is an abundant number, since it is smaller than the sum of its proper divisors (162220248).

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

81022752 is a wasteful number, since it uses less digits than its factorization.

81022752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 81022752 is about 9001.2639112516. The cubic root of 81022752 is about 432.7153784877.

The spelling of 81022752 in words is "eighty-one million, twenty-two thousand, seven hundred fifty-two".