204135640 has 32 divisors (see below), whose sum is σ = 475146000. Its totient is φ = 78838144.

The previous prime is 204135599. The next prime is 204135641. The reversal of 204135640 is 46531402.

204135640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204135641) 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, 86830 + ... + 89149.

Almost surely, 2^204135640 is an apocalyptic number.

204135640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204135640 is an abundant number, since it is smaller than the sum of its proper divisors (271010360).

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

204135640 is a wasteful number, since it uses less digits than its factorization.

204135640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176019 (or 176015 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 204135640 is about 14287.6044178162. The cubic root of 204135640 is about 588.8069735090.

The spelling of 204135640 in words is "two hundred four million, one hundred thirty-five thousand, six hundred forty".