204435990544 has 80 divisors (see below), whose sum is σ = 437587171200. Its totient is φ = 92091783168.

The previous prime is 204435990529. The next prime is 204435990581. The reversal of 204435990544 is 445099534402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1125112 + ... + 1294120.

It is an arithmetic number, because the mean of its divisors is an integer number (5469839640).

Almost surely, 2^204435990544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204435990544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218793585600).

204435990544 is an abundant number, since it is smaller than the sum of its proper divisors (233151180656).

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

204435990544 is a wasteful number, since it uses less digits than its factorization.

204435990544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169232 (or 169226 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 204435990544 in words is "two hundred four billion, four hundred thirty-five million, nine hundred ninety thousand, five hundred forty-four".