204650640 has 60 divisors (see below), whose sum is σ = 687287484. Its totient is φ = 54573312.

The previous prime is 204650617. The next prime is 204650671. The reversal of 204650640 is 46056402.

It is a happy number.

204650640 is a `hidden beast` number, since 2 + 0 + 4 + 650 + 6 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 65221776 + 139428864 = 8076^2 + 11808^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141399 + ... + 142838.

Almost surely, 2^204650640 is an apocalyptic number.

204650640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204650640 is an abundant number, since it is smaller than the sum of its proper divisors (482636844).

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

204650640 is a wasteful number, since it uses less digits than its factorization.

204650640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284256 (or 284247 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 204650640 is about 14305.6156805640. The cubic root of 204650640 is about 589.3017114587.

The spelling of 204650640 in words is "two hundred four million, six hundred fifty thousand, six hundred forty".