81429852 has 24 divisors (see below), whose sum is σ = 217146496. Its totient is φ = 23265648.

The previous prime is 81429827. The next prime is 81429893. The reversal of 81429852 is 25892418.

It is a self number, because there is not a number n which added to its sum of digits gives 81429852.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484618 + ... + 484785.

Almost surely, 2^81429852 is an apocalyptic number.

It is an amenable number.

81429852 is an abundant number, since it is smaller than the sum of its proper divisors (135716644).

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

81429852 is a wasteful number, since it uses less digits than its factorization.

81429852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969417 (or 969415 counting only the distinct ones).

The product of its digits is 46080, while the sum is 39.

The square root of 81429852 is about 9023.8490678867. The cubic root of 81429852 is about 433.4388963070.

The spelling of 81429852 in words is "eighty-one million, four hundred twenty-nine thousand, eight hundred fifty-two".