81494404 has 12 divisors (see below), whose sum is σ = 143413200. Its totient is φ = 40519208.

The previous prime is 81494393. The next prime is 81494407. The reversal of 81494404 is 40449418.

It is a self number, because there is not a number n which added to its sum of digits gives 81494404.

It is not an unprimeable number, because it can be changed into a prime (81494407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56194 + ... + 57625.

It is an arithmetic number, because the mean of its divisors is an integer number (11951100).

Almost surely, 2^81494404 is an apocalyptic number.

It is an amenable number.

81494404 is a deficient number, since it is larger than the sum of its proper divisors (61918796).

81494404 is a wasteful number, since it uses less digits than its factorization.

81494404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114002 (or 114000 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 81494404 is about 9027.4251035387. The cubic root of 81494404 is about 433.5533995956.

The spelling of 81494404 in words is "eighty-one million, four hundred ninety-four thousand, four hundred four".