204172668 has 36 divisors (see below), whose sum is σ = 589832880. Its totient is φ = 58334976.

The previous prime is 204172667. The next prime is 204172711. The reversal of 204172668 is 866271402.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204172663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 404853 + ... + 405356.

Almost surely, 2^204172668 is an apocalyptic number.

204172668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

204172668 is an abundant number, since it is smaller than the sum of its proper divisors (385660212).

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

204172668 is a wasteful number, since it uses less digits than its factorization.

204172668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810226 (or 810221 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 204172668 is about 14288.9001676126. The cubic root of 204172668 is about 588.8425724315.

The spelling of 204172668 in words is "two hundred four million, one hundred seventy-two thousand, six hundred sixty-eight".