81828260 has 24 divisors (see below), whose sum is σ = 172191096. Its totient is φ = 32664320.

The previous prime is 81828223. The next prime is 81828277. The reversal of 81828260 is 6282818.

It can be written as a sum of positive squares in 4 ways, for example, as 972196 + 80856064 = 986^2 + 8992^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81828260.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6494 + ... + 14346.

It is an arithmetic number, because the mean of its divisors is an integer number (7174629).

Almost surely, 2^81828260 is an apocalyptic number.

It is an amenable number.

81828260 is an abundant number, since it is smaller than the sum of its proper divisors (90362836).

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

81828260 is a wasteful number, since it uses less digits than its factorization.

81828260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8383 (or 8381 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 81828260 is about 9045.8974126396. The cubic root of 81828260 is about 434.1446352651.

The spelling of 81828260 in words is "eighty-one million, eight hundred twenty-eight thousand, two hundred sixty".