81040877 has 8 divisors (see below), whose sum is σ = 84986040. Its totient is φ = 77172480.

The previous prime is 81040867. The next prime is 81040889. The reversal of 81040877 is 77804018.

It can be written as a sum of positive squares in 4 ways, for example, as 37625956 + 43414921 = 6134^2 + 6589^2 .

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

It is not a de Polignac number, because 81040877 - 2²² = 76846573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81040847) 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, 17024 + ... + 21257.

It is an arithmetic number, because the mean of its divisors is an integer number (10623255).

Almost surely, 2^81040877 is an apocalyptic number.

It is an amenable number.

81040877 is a deficient number, since it is larger than the sum of its proper divisors (3945163).

81040877 is a wasteful number, since it uses less digits than its factorization.

81040877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38383.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 81040877 is about 9002.2706580062. The cubic root of 81040877 is about 432.7476425999.

The spelling of 81040877 in words is "eighty-one million, forty thousand, eight hundred seventy-seven".