81830478 has 32 divisors (see below), whose sum is σ = 167777280. Its totient is φ = 26595360.

The previous prime is 81830477. The next prime is 81830521. The reversal of 81830478 is 87403818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81830471) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 123468 + ... + 124128.

It is an arithmetic number, because the mean of its divisors is an integer number (5243040).

Almost surely, 2^81830478 is an apocalyptic number.

81830478 is an abundant number, since it is smaller than the sum of its proper divisors (85946802).

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

81830478 is a wasteful number, since it uses less digits than its factorization.

81830478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152.

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

The square root of 81830478 is about 9046.0200088216. The cubic root of 81830478 is about 434.1485578060.

The spelling of 81830478 in words is "eighty-one million, eight hundred thirty thousand, four hundred seventy-eight".