81548632 has 16 divisors (see below), whose sum is σ = 166804200. Its totient is φ = 37067520.

The previous prime is 81548603. The next prime is 81548633. The reversal of 81548632 is 23684518.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81548591 and 81548600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81548633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463257 + ... + 463432.

Almost surely, 2^81548632 is an apocalyptic number.

It is an amenable number.

81548632 is an abundant number, since it is smaller than the sum of its proper divisors (85255568).

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

81548632 is a wasteful number, since it uses less digits than its factorization.

81548632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926706 (or 926702 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 81548632 is about 9030.4281183120. The cubic root of 81548632 is about 433.6495432966.

It can be divided in two parts, 815486 and 32, that added together give a palindrome (815518).

The spelling of 81548632 in words is "eighty-one million, five hundred forty-eight thousand, six hundred thirty-two".