81204204 has 12 divisors (see below), whose sum is σ = 189476504. Its totient is φ = 27068064.

The previous prime is 81204197. The next prime is 81204239. The reversal of 81204204 is 40240218.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3383497 + ... + 3383520.

Almost surely, 2^81204204 is an apocalyptic number.

It is an amenable number.

81204204 is an abundant number, since it is smaller than the sum of its proper divisors (108272300).

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

81204204 is a wasteful number, since it uses less digits than its factorization.

81204204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6767024 (or 6767022 counting only the distinct ones).

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

The square root of 81204204 is about 9011.3375255841. The cubic root of 81204204 is about 433.0381624311.

The spelling of 81204204 in words is "eighty-one million, two hundred four thousand, two hundred four".