81960732 has 108 divisors (see below), whose sum is σ = 243996480. Its totient is φ = 23127552.

The previous prime is 81960727. The next prime is 81960733. The reversal of 81960732 is 23706918.

81960732 is a `hidden beast` number, since 8 + 19 + 607 + 32 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81960733) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 170869 + ... + 171347.

Almost surely, 2^81960732 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 81960732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121998240).

81960732 is an abundant number, since it is smaller than the sum of its proper divisors (162035748).

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

81960732 is a wasteful number, since it uses less digits than its factorization.

81960732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600 (or 588 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 81960732 is about 9053.2166659149. The cubic root of 81960732 is about 434.3787882767.

The spelling of 81960732 in words is "eighty-one million, nine hundred sixty thousand, seven hundred thirty-two".