81602730 has 96 divisors (see below), whose sum is σ = 233513280. Its totient is φ = 19607040.

The previous prime is 81602711. The next prime is 81602743. The reversal of 81602730 is 3720618.

It is a junction number, because it is equal to n+sod(n) for n = 81602694 and 81602703.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 137314 + ... + 137906.

It is an arithmetic number, because the mean of its divisors is an integer number (2432430).

Almost surely, 2^81602730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81602730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116756640).

81602730 is an abundant number, since it is smaller than the sum of its proper divisors (151910550).

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

81602730 is a wasteful number, since it uses less digits than its factorization.

81602730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 81602730 is about 9033.4229392850. The cubic root of 81602730 is about 433.7454140540.

The spelling of 81602730 in words is "eighty-one million, six hundred two thousand, seven hundred thirty".