81632012 has 48 divisors (see below), whose sum is σ = 179843328. Its totient is φ = 31494720.

The previous prime is 81632009. The next prime is 81632041. The reversal of 81632012 is 21023618.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31718 + ... + 34194.

It is an arithmetic number, because the mean of its divisors is an integer number (3746736).

Almost surely, 2^81632012 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 81632012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89921664).

81632012 is an abundant number, since it is smaller than the sum of its proper divisors (98211316).

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

81632012 is a wasteful number, since it uses less digits than its factorization.

81632012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606 (or 2604 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 81632012 is about 9035.0435527451. The cubic root of 81632012 is about 433.7972890110.

The spelling of 81632012 in words is "eighty-one million, six hundred thirty-two thousand, twelve".