81366204 has 12 divisors (see below), whose sum is σ = 189854504. Its totient is φ = 27122064.

The previous prime is 81366193. The next prime is 81366217. The reversal of 81366204 is 40266318.

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

It is a congruent number.

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, 3390247 + ... + 3390270.

Almost surely, 2^81366204 is an apocalyptic number.

It is an amenable number.

81366204 is an abundant number, since it is smaller than the sum of its proper divisors (108488300).

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

81366204 is a wasteful number, since it uses less digits than its factorization.

81366204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780524 (or 6780522 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 81366204 is about 9020.3217237524. The cubic root of 81366204 is about 433.3259372834.

The spelling of 81366204 in words is "eighty-one million, three hundred sixty-six thousand, two hundred four".