81022660 has 12 divisors (see below), whose sum is σ = 170147628. Its totient is φ = 32409056.

The previous prime is 81022649. The next prime is 81022679. The reversal of 81022660 is 6622018.

It can be written as a sum of positive squares in 2 ways, for example, as 50353216 + 30669444 = 7096^2 + 5538^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2025547 + ... + 2025586.

It is an arithmetic number, because the mean of its divisors is an integer number (14178969).

Almost surely, 2^81022660 is an apocalyptic number.

It is an amenable number.

81022660 is an abundant number, since it is smaller than the sum of its proper divisors (89124968).

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

81022660 is a wasteful number, since it uses less digits than its factorization.

81022660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4051142 (or 4051140 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 81022660 is about 9001.2588008567. The cubic root of 81022660 is about 432.7152147072.

Adding to 81022660 its reverse (6622018), we get a palindrome (87644678).

The spelling of 81022660 in words is "eighty-one million, twenty-two thousand, six hundred sixty".