81868460 has 24 divisors (see below), whose sum is σ = 173184480. Its totient is φ = 32507264.

The previous prime is 81868441. The next prime is 81868469. The reversal of 81868460 is 6486818.

It is not an unprimeable number, because it can be changed into a prime (81868469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12200 + ... + 17679.

It is an arithmetic number, because the mean of its divisors is an integer number (7216020).

Almost surely, 2^81868460 is an apocalyptic number.

It is an amenable number.

81868460 is an abundant number, since it is smaller than the sum of its proper divisors (91316020).

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

81868460 is a wasteful number, since it uses less digits than its factorization.

81868460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30025 (or 30023 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 81868460 is about 9048.1191415675. The cubic root of 81868460 is about 434.2157181123.

It can be divided in two parts, 81868 and 460, that added together give a palindrome (82328).

The spelling of 81868460 in words is "eighty-one million, eight hundred sixty-eight thousand, four hundred sixty".