81043404 has 24 divisors (see below), whose sum is σ = 203647920. Its totient is φ = 24936384.

The previous prime is 81043397. The next prime is 81043409. The reversal of 81043404 is 40434018.

It is not an unprimeable number, because it can be changed into a prime (81043409) 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, 259599 + ... + 259910.

It is an arithmetic number, because the mean of its divisors is an integer number (8485330).

Almost surely, 2^81043404 is an apocalyptic number.

It is an amenable number.

81043404 is an abundant number, since it is smaller than the sum of its proper divisors (122604516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81043404 is a wasteful number, since it uses less digits than its factorization.

81043404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519529 (or 519527 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 81043404 is about 9002.4110103905. The cubic root of 81043404 is about 432.7521405025.

The spelling of 81043404 in words is "eighty-one million, forty-three thousand, four hundred four".