81148732 has 12 divisors (see below), whose sum is σ = 162297520. Its totient is φ = 34778016.

The previous prime is 81148709. The next prime is 81148741. The reversal of 81148732 is 23784118.

It is a happy number.

81148732 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1449057 + ... + 1449112.

Almost surely, 2^81148732 is an apocalyptic number.

It is an amenable number.

81148732 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81148732 is a wasteful number, since it uses less digits than its factorization.

81148732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898180 (or 2898178 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 81148732 is about 9008.2590992933. The cubic root of 81148732 is about 432.9395346767.

The spelling of 81148732 in words is "eighty-one million, one hundred forty-eight thousand, seven hundred thirty-two".