205387764 has 12 divisors (see below), whose sum is σ = 479238144. Its totient is φ = 68462584.

The previous prime is 205387753. The next prime is 205387771. The reversal of 205387764 is 467783502.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8557812 + ... + 8557835.

It is an arithmetic number, because the mean of its divisors is an integer number (39936512).

Almost surely, 2^205387764 is an apocalyptic number.

It is an amenable number.

205387764 is an abundant number, since it is smaller than the sum of its proper divisors (273850380).

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

205387764 is a wasteful number, since it uses less digits than its factorization.

205387764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17115654 (or 17115652 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The square root of 205387764 is about 14331.3559721333. The cubic root of 205387764 is about 590.0083921051.

The spelling of 205387764 in words is "two hundred five million, three hundred eighty-seven thousand, seven hundred sixty-four".