81004474 has 16 divisors (see below), whose sum is σ = 124236000. Its totient is φ = 39601584.

The previous prime is 81004423. The next prime is 81004489. The reversal of 81004474 is 47440018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16452 + ... + 20800.

It is an arithmetic number, because the mean of its divisors is an integer number (7764750).

Almost surely, 2^81004474 is an apocalyptic number.

81004474 is a deficient number, since it is larger than the sum of its proper divisors (43231526).

81004474 is a wasteful number, since it uses less digits than its factorization.

81004474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4557.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 81004474 is about 9000.2485521234. The cubic root of 81004474 is about 432.6828371487.

The spelling of 81004474 in words is "eighty-one million, four thousand, four hundred seventy-four".