204638751772 has 144 divisors (see below), whose sum is σ = 453692897280. Its totient is φ = 79050726144.

The previous prime is 204638751697. The next prime is 204638751773. The reversal of 204638751772 is 277157836402.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204638751773) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55925679 + ... + 55929337.

It is an arithmetic number, because the mean of its divisors is an integer number (3150645120).

Almost surely, 2^204638751772 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 204638751772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226846448640).

204638751772 is an abundant number, since it is smaller than the sum of its proper divisors (249054145508).

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

204638751772 is a wasteful number, since it uses less digits than its factorization.

204638751772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972 (or 3957 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 52.

The spelling of 204638751772 in words is "two hundred four billion, six hundred thirty-eight million, seven hundred fifty-one thousand, seven hundred seventy-two".