81718204 has 12 divisors (see below), whose sum is σ = 143756928. Its totient is φ = 40644800.

The previous prime is 81718187. The next prime is 81718211. The reversal of 81718204 is 40281718.

It is a congruent number.

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, 52717 + ... + 54244.

It is an arithmetic number, because the mean of its divisors is an integer number (11979744).

Almost surely, 2^81718204 is an apocalyptic number.

It is an amenable number.

81718204 is a deficient number, since it is larger than the sum of its proper divisors (62038724).

81718204 is a wasteful number, since it uses less digits than its factorization.

81718204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107156 (or 107154 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 81718204 is about 9039.8121661902. The cubic root of 81718204 is about 433.9499117516.

The spelling of 81718204 in words is "eighty-one million, seven hundred eighteen thousand, two hundred four".