81818410 has 8 divisors (see below), whose sum is σ = 147273156. Its totient is φ = 32727360.

The previous prime is 81818377. The next prime is 81818419. The reversal of 81818410 is 1481818.

It can be written as a sum of positive squares in 2 ways, for example, as 79905721 + 1912689 = 8939^2 + 1383^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81818419) 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, 4090911 + ... + 4090930.

Almost surely, 2^81818410 is an apocalyptic number.

81818410 is a deficient number, since it is larger than the sum of its proper divisors (65454746).

81818410 is a wasteful number, since it uses less digits than its factorization.

81818410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8181848.

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 81818410 is about 9045.3529505487. The cubic root of 81818410 is about 434.1272146484.

It can be divided in two parts, 81818 and 410, that added together give a palindrome (82228).

The spelling of 81818410 in words is "eighty-one million, eight hundred eighteen thousand, four hundred ten".