81012832 has 48 divisors (see below), whose sum is σ = 167024592. Its totient is φ = 38638080.

The previous prime is 81012823. The next prime is 81012839. The reversal of 81012832 is 23821018.

It is a junction number, because it is equal to n+sod(n) for n = 81012797 and 81012806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81012839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62107 + ... + 63397.

It is an arithmetic number, because the mean of its divisors is an integer number (3479679).

Almost surely, 2^81012832 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 81012832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83512296).

81012832 is an abundant number, since it is smaller than the sum of its proper divisors (86011760).

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

81012832 is a wasteful number, since it uses less digits than its factorization.

81012832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391 (or 1383 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 81012832 is about 9000.7128606572. The cubic root of 81012832 is about 432.6977179679.

The spelling of 81012832 in words is "eighty-one million, twelve thousand, eight hundred thirty-two".