81002852 has 48 divisors (see below), whose sum is σ = 172247040. Its totient is φ = 32558112.

The previous prime is 81002851. The next prime is 81002863. The reversal of 81002852 is 25820018.

It is a super-2 number, since 2×81002852² = 13122924064267808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81002851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56213 + ... + 57635.

It is an arithmetic number, because the mean of its divisors is an integer number (3588480).

Almost surely, 2^81002852 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 81002852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86123520).

81002852 is an abundant number, since it is smaller than the sum of its proper divisors (91244188).

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

81002852 is a wasteful number, since it uses less digits than its factorization.

81002852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 1558 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 81002852 is about 9000.1584430498. The cubic root of 81002852 is about 432.6799491756.

The spelling of 81002852 in words is "eighty-one million, two thousand, eight hundred fifty-two".