81042204 has 12 divisors (see below), whose sum is σ = 189098504. Its totient is φ = 27014064.

The previous prime is 81042187. The next prime is 81042209. The reversal of 81042204 is 40224018.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81042209) 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 3 ways as a sum of consecutive naturals, for example, 3376747 + ... + 3376770.

Almost surely, 2^81042204 is an apocalyptic number.

It is an amenable number.

81042204 is an abundant number, since it is smaller than the sum of its proper divisors (108056300).

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

81042204 is a wasteful number, since it uses less digits than its factorization.

81042204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6753524 (or 6753522 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 81042204 is about 9002.3443613317. The cubic root of 81042204 is about 432.7500045889.

The spelling of 81042204 in words is "eighty-one million, forty-two thousand, two hundred four".