81730884 has 12 divisors (see below), whose sum is σ = 190705424. Its totient is φ = 27243624.

The previous prime is 81730877. The next prime is 81730889. The reversal of 81730884 is 48803718.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (81730889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3405442 + ... + 3405465.

Almost surely, 2^81730884 is an apocalyptic number.

It is an amenable number.

81730884 is an abundant number, since it is smaller than the sum of its proper divisors (108974540).

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

81730884 is a wasteful number, since it uses less digits than its factorization.

81730884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6810914 (or 6810912 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 81730884 is about 9040.5134809921. The cubic root of 81730884 is about 433.9723555484.

The spelling of 81730884 in words is "eighty-one million, seven hundred thirty thousand, eight hundred eighty-four".