81832878 has 12 divisors (see below), whose sum is σ = 177304608. Its totient is φ = 27277620.

The previous prime is 81832871. The next prime is 81832879. The reversal of 81832878 is 87823818.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81832871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2273118 + ... + 2273153.

It is an arithmetic number, because the mean of its divisors is an integer number (14775384).

Almost surely, 2^81832878 is an apocalyptic number.

81832878 is an abundant number, since it is smaller than the sum of its proper divisors (95471730).

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

81832878 is a wasteful number, since it uses less digits than its factorization.

81832878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4546279 (or 4546276 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The square root of 81832878 is about 9046.1526628728. The cubic root of 81832878 is about 434.1528021348.

The spelling of 81832878 in words is "eighty-one million, eight hundred thirty-two thousand, eight hundred seventy-eight".