81718700 has 36 divisors (see below), whose sum is σ = 202664112. Its totient is φ = 28017600.

The previous prime is 81718673. The next prime is 81718751. The reversal of 81718700 is 781718.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57671 + ... + 59070.

Almost surely, 2^81718700 is an apocalyptic number.

It is an amenable number.

81718700 is an abundant number, since it is smaller than the sum of its proper divisors (120945412).

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

81718700 is a wasteful number, since it uses less digits than its factorization.

81718700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116762 (or 116755 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 32.

The square root of 81718700 is about 9039.8396003469. The cubic root of 81718700 is about 433.9507897229.

The spelling of 81718700 in words is "eighty-one million, seven hundred eighteen thousand, seven hundred".