81010260 has 96 divisors (see below), whose sum is σ = 258249600. Its totient is φ = 21070080.

The previous prime is 81010231. The next prime is 81010261. The reversal of 81010260 is 6201018.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81010261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20311 + ... + 23969.

It is an arithmetic number, because the mean of its divisors is an integer number (2690100).

Almost surely, 2^81010260 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 81010260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129124800).

81010260 is an abundant number, since it is smaller than the sum of its proper divisors (177239340).

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

81010260 is a wasteful number, since it uses less digits than its factorization.

81010260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3718 (or 3710 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 81010260 is about 9000.5699819511. The cubic root of 81010260 is about 432.6931388155.

Adding to 81010260 its reverse (6201018), we get a palindrome (87211278).

The spelling of 81010260 in words is "eighty-one million, ten thousand, two hundred sixty".