81814360 has 16 divisors (see below), whose sum is σ = 184082400. Its totient is φ = 32725728.

The previous prime is 81814339. The next prime is 81814429. The reversal of 81814360 is 6341818.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1022640 + ... + 1022719.

It is an arithmetic number, because the mean of its divisors is an integer number (11505150).

Almost surely, 2^81814360 is an apocalyptic number.

It is an amenable number.

81814360 is an abundant number, since it is smaller than the sum of its proper divisors (102268040).

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

81814360 is a wasteful number, since it uses less digits than its factorization.

81814360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045370 (or 2045366 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 81814360 is about 9045.1290759170. The cubic root of 81814360 is about 434.1200514511.

The spelling of 81814360 in words is "eighty-one million, eight hundred fourteen thousand, three hundred sixty".