81004467 has 16 divisors (see below), whose sum is σ = 115136000. Its totient is φ = 50510304.

The previous prime is 81004423. The next prime is 81004489. The reversal of 81004467 is 76440018.

It is not a de Polignac number, because 81004467 - 2¹² = 81000371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81004067) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4492 + ... + 13497.

It is an arithmetic number, because the mean of its divisors is an integer number (7196000).

Almost surely, 2^81004467 is an apocalyptic number.

81004467 is a deficient number, since it is larger than the sum of its proper divisors (34131533).

81004467 is a wasteful number, since it uses less digits than its factorization.

81004467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18090.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 81004467 is about 9000.2481632453. The cubic root of 81004467 is about 432.6828246853.

The spelling of 81004467 in words is "eighty-one million, four thousand, four hundred sixty-seven".