81675836 has 12 divisors (see below), whose sum is σ = 155926680. Its totient is φ = 37125360.

The previous prime is 81675833. The next prime is 81675929. The reversal of 81675836 is 63857618.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 1856269 = 81675836 / (8 + 1 + 6 + 7 + 5 + 8 + 3 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81675833) 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, 928091 + ... + 928178.

It is an arithmetic number, because the mean of its divisors is an integer number (12993890).

Almost surely, 2^81675836 is an apocalyptic number.

It is an amenable number.

81675836 is a deficient number, since it is larger than the sum of its proper divisors (74250844).

81675836 is a wasteful number, since it uses less digits than its factorization.

81675836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856284 (or 1856282 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 81675836 is about 9037.4684508440. The cubic root of 81675836 is about 433.8749028906.

The spelling of 81675836 in words is "eighty-one million, six hundred seventy-five thousand, eight hundred thirty-six".