81504466 has 12 divisors (see below), whose sum is σ = 122933178. Its totient is φ = 40527872.

The previous prime is 81504463. The next prime is 81504491. The reversal of 81504466 is 66440518.

It can be written as a sum of positive squares in 3 ways, for example, as 81378441 + 126025 = 9021^2 + 355^2 .

It is not an unprimeable number, because it can be changed into a prime (81504463) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 131790 + ... + 132406.

Almost surely, 2^81504466 is an apocalyptic number.

81504466 is a deficient number, since it is larger than the sum of its proper divisors (41428712).

81504466 is an equidigital number, since it uses as much as digits as its factorization.

81504466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 876 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 81504466 is about 9027.9823881087. The cubic root of 81504466 is about 433.5712422717.

The spelling of 81504466 in words is "eighty-one million, five hundred four thousand, four hundred sixty-six".