81632052 has 72 divisors (see below), whose sum is σ = 214672640. Its totient is φ = 26127360.

The previous prime is 81632051. The next prime is 81632093. The reversal of 81632052 is 25023618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81632051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 215199 + ... + 215577.

Almost surely, 2^81632052 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 81632052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107336320).

81632052 is an abundant number, since it is smaller than the sum of its proper divisors (133040588).

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

81632052 is a wasteful number, since it uses less digits than its factorization.

81632052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 81632052 is about 9035.0457663478. The cubic root of 81632052 is about 433.7973598651.

The spelling of 81632052 in words is "eighty-one million, six hundred thirty-two thousand, fifty-two".