81040382 has 8 divisors (see below), whose sum is σ = 122009952. Its totient is φ = 40370400.

The previous prime is 81040381. The next prime is 81040387. The reversal of 81040382 is 28304018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81040381) 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, 74219 + ... + 75302.

It is an arithmetic number, because the mean of its divisors is an integer number (15251244).

Almost surely, 2^81040382 is an apocalyptic number.

81040382 is a deficient number, since it is larger than the sum of its proper divisors (40969570).

81040382 is a wasteful number, since it uses less digits than its factorization.

81040382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149794.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 81040382 is about 9002.2431649006. The cubic root of 81040382 is about 432.7467615197.

The spelling of 81040382 in words is "eighty-one million, forty thousand, three hundred eighty-two".