81718284 has 24 divisors (see below), whose sum is σ = 193803568. Its totient is φ = 26792640.

The previous prime is 81718283. The next prime is 81718291. The reversal of 81718284 is 48281718.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81718283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55087 + ... + 56550.

Almost surely, 2^81718284 is an apocalyptic number.

It is an amenable number.

81718284 is an abundant number, since it is smaller than the sum of its proper divisors (112085284).

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

81718284 is a wasteful number, since it uses less digits than its factorization.

81718284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111705 (or 111703 counting only the distinct ones).

The product of its digits is 28672, while the sum is 39.

The square root of 81718284 is about 9039.8165910598. The cubic root of 81718284 is about 433.9500533601.

The spelling of 81718284 in words is "eighty-one million, seven hundred eighteen thousand, two hundred eighty-four".