81828660 has 24 divisors (see below), whose sum is σ = 229120416. Its totient is φ = 21820960.

The previous prime is 81828653. The next prime is 81828673. The reversal of 81828660 is 6682818.

It is a congruent number.

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, 681846 + ... + 681965.

It is an arithmetic number, because the mean of its divisors is an integer number (9546684).

Almost surely, 2^81828660 is an apocalyptic number.

It is an amenable number.

81828660 is an abundant number, since it is smaller than the sum of its proper divisors (147291756).

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

81828660 is a wasteful number, since it uses less digits than its factorization.

81828660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363823 (or 1363821 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 81828660 is about 9045.9195220829. The cubic root of 81828660 is about 434.1453426718.

The spelling of 81828660 in words is "eighty-one million, eight hundred twenty-eight thousand, six hundred sixty".