81812632 has 64 divisors (see below), whose sum is σ = 177811200. Its totient is φ = 34899840.

The previous prime is 81812623. The next prime is 81812639. The reversal of 81812632 is 23621818.

It is a junction number, because it is equal to n+sod(n) for n = 81812594 and 81812603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81812639) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 279078 + ... + 279370.

It is an arithmetic number, because the mean of its divisors is an integer number (2778300).

Almost surely, 2^81812632 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 81812632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88905600).

81812632 is an abundant number, since it is smaller than the sum of its proper divisors (95998568).

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

81812632 is a wasteful number, since it uses less digits than its factorization.

81812632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 492 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 81812632 is about 9045.0335543877. The cubic root of 81812632 is about 434.1169950817.

The spelling of 81812632 in words is "eighty-one million, eight hundred twelve thousand, six hundred thirty-two".