81002760 has 64 divisors (see below), whose sum is σ = 245548800. Its totient is φ = 21374976.

The previous prime is 81002741. The next prime is 81002767. The reversal of 81002760 is 6720018.

It is a super-2 number, since 2×81002760² = 13122894255235200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 81002760.

It is not an unprimeable number, because it can be changed into a prime (81002767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8161 + ... + 15119.

It is an arithmetic number, because the mean of its divisors is an integer number (3836700).

Almost surely, 2^81002760 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 81002760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122774400).

81002760 is an abundant number, since it is smaller than the sum of its proper divisors (164546040).

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

81002760 is a wasteful number, since it uses less digits than its factorization.

81002760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7070 (or 7066 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 81002760 is about 9000.1533320272. The cubic root of 81002760 is about 432.6797853683.

Adding to 81002760 its reverse (6720018), we get a palindrome (87722778).

The spelling of 81002760 in words is "eighty-one million, two thousand, seven hundred sixty".