81825732 has 36 divisors (see below), whose sum is σ = 211651440. Its totient is φ = 26640432.

The previous prime is 81825707. The next prime is 81825769. The reversal of 81825732 is 23752818.

81825732 is a `hidden beast` number, since 8 + 1 + 82 + 573 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24882 + ... + 27977.

Almost surely, 2^81825732 is an apocalyptic number.

It is an amenable number.

81825732 is an abundant number, since it is smaller than the sum of its proper divisors (129825708).

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

81825732 is a wasteful number, since it uses less digits than its factorization.

81825732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52912 (or 52907 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 81825732 is about 9045.7576797082. The cubic root of 81825732 is about 434.1401644016.

The spelling of 81825732 in words is "eighty-one million, eight hundred twenty-five thousand, seven hundred thirty-two".