81002730 has 16 divisors (see below), whose sum is σ = 194406624. Its totient is φ = 21600720.

The previous prime is 81002723. The next prime is 81002741. The reversal of 81002730 is 3720018.

It is a super-2 number, since 2×81002730² = 13122884534905800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81002697 and 81002706.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1350016 + ... + 1350075.

It is an arithmetic number, because the mean of its divisors is an integer number (12150414).

Almost surely, 2^81002730 is an apocalyptic number.

81002730 is an abundant number, since it is smaller than the sum of its proper divisors (113403894).

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

81002730 is a wasteful number, since it uses less digits than its factorization.

81002730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700101.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 81002730 is about 9000.1516653888. The cubic root of 81002730 is about 432.6797319528.

Adding to 81002730 its reverse (3720018), we get a palindrome (84722748).

The spelling of 81002730 in words is "eighty-one million, two thousand, seven hundred thirty".