81029412 has 72 divisors (see below), whose sum is σ = 223921152. Its totient is φ = 24595200.

The previous prime is 81029359. The next prime is 81029447. The reversal of 81029412 is 21492018.

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, 16837 + ... + 21107.

It is an arithmetic number, because the mean of its divisors is an integer number (3110016).

Almost surely, 2^81029412 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 81029412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111960576).

81029412 is an abundant number, since it is smaller than the sum of its proper divisors (142891740).

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

81029412 is a wasteful number, since it uses less digits than its factorization.

81029412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4329 (or 4324 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 81029412 is about 9001.6338516960. The cubic root of 81029412 is about 432.7272344392.

The spelling of 81029412 in words is "eighty-one million, twenty-nine thousand, four hundred twelve".