81441826 has 16 divisors (see below), whose sum is σ = 125887608. Its totient is φ = 39491200.

The previous prime is 81441823. The next prime is 81441859. The reversal of 81441826 is 62814418.

It can be written as a sum of positive squares in 4 ways, for example, as 66994225 + 14447601 = 8185^2 + 3801^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81441791 and 81441800.

It is not an unprimeable number, because it can be changed into a prime (81441821) 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, 11316 + ... + 17056.

Almost surely, 2^81441826 is an apocalyptic number.

81441826 is a deficient number, since it is larger than the sum of its proper divisors (44445782).

81441826 is a wasteful number, since it uses less digits than its factorization.

81441826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5957.

The product of its digits is 12288, while the sum is 34.

The square root of 81441826 is about 9024.5125076095. The cubic root of 81441826 is about 433.4601405348.

The spelling of 81441826 in words is "eighty-one million, four hundred forty-one thousand, eight hundred twenty-six".