81047032 has 48 divisors (see below), whose sum is σ = 173398680. Its totient is φ = 35217600.

The previous prime is 81046981. The next prime is 81047033. The reversal of 81047032 is 23074018.

It is a junction number, because it is equal to n+sod(n) for n = 81046988 and 81047006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81047033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45682 + ... + 47422.

Almost surely, 2^81047032 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 81047032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86699340).

81047032 is an abundant number, since it is smaller than the sum of its proper divisors (92351648).

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

81047032 is a wasteful number, since it uses less digits than its factorization.

81047032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804 (or 1777 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 81047032 is about 9002.6125097107. The cubic root of 81047032 is about 432.7585979531.

The spelling of 81047032 in words is "eighty-one million, forty-seven thousand, thirty-two".