204345645 has 64 divisors (see below), whose sum is σ = 391888896. Its totient is φ = 88957440.

The previous prime is 204345643. The next prime is 204345677. The reversal of 204345645 is 546543402.

204345645 = T₁₃₄ + T₁₃₅ + ... + T₁₀₇₀.

It is not a de Polignac number, because 204345645 - 2¹ = 204345643 is a prime.

It is a super-3 number, since 3×204345645³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204345641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 217617 + ... + 218553.

It is an arithmetic number, because the mean of its divisors is an integer number (6123264).

Almost surely, 2^204345645 is an apocalyptic number.

It is an amenable number.

204345645 is a deficient number, since it is larger than the sum of its proper divisors (187543251).

204345645 is a wasteful number, since it uses less digits than its factorization.

204345645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050.

The product of its (nonzero) digits is 57600, while the sum is 33.

The square root of 204345645 is about 14294.9517312931. The cubic root of 204345645 is about 589.0088164766.

The spelling of 204345645 in words is "two hundred four million, three hundred forty-five thousand, six hundred forty-five".